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"""Module for interactive demos using IPython.
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"""Module for interactive demos using IPython.
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This module implements a few classes for running Python scripts interactively
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This module implements a few classes for running Python scripts interactively
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in IPython for demonstrations. With very simple markup (a few tags in
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in IPython for demonstrations. With very simple markup (a few tags in
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comments), you can control points where the script stops executing and returns
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comments), you can control points where the script stops executing and returns
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control to IPython.
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control to IPython.
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Provided classes
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Provided classes
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================
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================
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The classes are (see their docstrings for further details):
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The classes are (see their docstrings for further details):
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- Demo: pure python demos
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- Demo: pure python demos
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- IPythonDemo: demos with input to be processed by IPython as if it had been
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- IPythonDemo: demos with input to be processed by IPython as if it had been
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typed interactively (so magics work, as well as any other special syntax you
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typed interactively (so magics work, as well as any other special syntax you
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may have added via input prefilters).
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may have added via input prefilters).
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- LineDemo: single-line version of the Demo class. These demos are executed
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- LineDemo: single-line version of the Demo class. These demos are executed
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one line at a time, and require no markup.
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one line at a time, and require no markup.
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- IPythonLineDemo: IPython version of the LineDemo class (the demo is
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- IPythonLineDemo: IPython version of the LineDemo class (the demo is
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executed a line at a time, but processed via IPython).
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executed a line at a time, but processed via IPython).
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- ClearMixin: mixin to make Demo classes with less visual clutter. It
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- ClearMixin: mixin to make Demo classes with less visual clutter. It
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declares an empty marquee and a pre_cmd that clears the screen before each
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declares an empty marquee and a pre_cmd that clears the screen before each
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block (see Subclassing below).
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block (see Subclassing below).
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- ClearDemo, ClearIPDemo: mixin-enabled versions of the Demo and IPythonDemo
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- ClearDemo, ClearIPDemo: mixin-enabled versions of the Demo and IPythonDemo
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classes.
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classes.
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Subclassing
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Subclassing
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===========
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===========
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The classes here all include a few methods meant to make customization by
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The classes here all include a few methods meant to make customization by
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subclassing more convenient. Their docstrings below have some more details:
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subclassing more convenient. Their docstrings below have some more details:
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- marquee(): generates a marquee to provide visible on-screen markers at each
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- marquee(): generates a marquee to provide visible on-screen markers at each
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block start and end.
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block start and end.
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- pre_cmd(): run right before the execution of each block.
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- pre_cmd(): run right before the execution of each block.
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- post_cmd(): run right after the execution of each block. If the block
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- post_cmd(): run right after the execution of each block. If the block
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raises an exception, this is NOT called.
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raises an exception, this is NOT called.
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Operation
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Operation
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=========
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=========
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The file is run in its own empty namespace (though you can pass it a string of
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The file is run in its own empty namespace (though you can pass it a string of
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arguments as if in a command line environment, and it will see those as
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arguments as if in a command line environment, and it will see those as
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sys.argv). But at each stop, the global IPython namespace is updated with the
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sys.argv). But at each stop, the global IPython namespace is updated with the
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current internal demo namespace, so you can work interactively with the data
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current internal demo namespace, so you can work interactively with the data
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accumulated so far.
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accumulated so far.
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By default, each block of code is printed (with syntax highlighting) before
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By default, each block of code is printed (with syntax highlighting) before
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executing it and you have to confirm execution. This is intended to show the
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executing it and you have to confirm execution. This is intended to show the
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code to an audience first so you can discuss it, and only proceed with
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code to an audience first so you can discuss it, and only proceed with
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execution once you agree. There are a few tags which allow you to modify this
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execution once you agree. There are a few tags which allow you to modify this
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behavior.
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behavior.
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The supported tags are:
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The supported tags are:
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# <demo> stop
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# <demo> stop
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Defines block boundaries, the points where IPython stops execution of the
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Defines block boundaries, the points where IPython stops execution of the
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file and returns to the interactive prompt.
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file and returns to the interactive prompt.
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You can optionally mark the stop tag with extra dashes before and after the
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You can optionally mark the stop tag with extra dashes before and after the
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word 'stop', to help visually distinguish the blocks in a text editor:
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word 'stop', to help visually distinguish the blocks in a text editor:
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# <demo> --- stop ---
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# <demo> --- stop ---
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# <demo> silent
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# <demo> silent
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Make a block execute silently (and hence automatically). Typically used in
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Make a block execute silently (and hence automatically). Typically used in
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cases where you have some boilerplate or initialization code which you need
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cases where you have some boilerplate or initialization code which you need
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executed but do not want to be seen in the demo.
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executed but do not want to be seen in the demo.
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# <demo> auto
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# <demo> auto
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Make a block execute automatically, but still being printed. Useful for
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Make a block execute automatically, but still being printed. Useful for
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simple code which does not warrant discussion, since it avoids the extra
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simple code which does not warrant discussion, since it avoids the extra
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manual confirmation.
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manual confirmation.
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# <demo> auto_all
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# <demo> auto_all
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This tag can _only_ be in the first block, and if given it overrides the
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This tag can _only_ be in the first block, and if given it overrides the
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individual auto tags to make the whole demo fully automatic (no block asks
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individual auto tags to make the whole demo fully automatic (no block asks
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for confirmation). It can also be given at creation time (or the attribute
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for confirmation). It can also be given at creation time (or the attribute
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set later) to override what's in the file.
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set later) to override what's in the file.
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While _any_ python file can be run as a Demo instance, if there are no stop
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While _any_ python file can be run as a Demo instance, if there are no stop
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tags the whole file will run in a single block (no different that calling
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tags the whole file will run in a single block (no different that calling
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first %pycat and then %run). The minimal markup to make this useful is to
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first %pycat and then %run). The minimal markup to make this useful is to
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place a set of stop tags; the other tags are only there to let you fine-tune
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place a set of stop tags; the other tags are only there to let you fine-tune
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the execution.
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the execution.
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This is probably best explained with the simple example file below. You can
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This is probably best explained with the simple example file below. You can
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copy this into a file named ex_demo.py, and try running it via:
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copy this into a file named ex_demo.py, and try running it via:
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from IPython.demo import Demo
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from IPython.demo import Demo
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d = Demo('ex_demo.py')
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d = Demo('ex_demo.py')
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d() <--- Call the d object (omit the parens if you have autocall set to 2).
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d() <--- Call the d object (omit the parens if you have autocall set to 2).
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Each time you call the demo object, it runs the next block. The demo object
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Each time you call the demo object, it runs the next block. The demo object
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has a few useful methods for navigation, like again(), edit(), jump(), seek()
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has a few useful methods for navigation, like again(), edit(), jump(), seek()
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and back(). It can be reset for a new run via reset() or reloaded from disk
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and back(). It can be reset for a new run via reset() or reloaded from disk
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(in case you've edited the source) via reload(). See their docstrings below.
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(in case you've edited the source) via reload(). See their docstrings below.
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Note: To make this simpler to explore, a file called "demoExercizer.py" has
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been added to the \ipython\docs\examples\core. Just cd to this directory in
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an IPython session, and type:
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run demoExercizer.py
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and then follow the directions.
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Example
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Example
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=======
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=======
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The following is a very simple example of a valid demo file.
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The following is a very simple example of a valid demo file.
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#################### EXAMPLE DEMO <ex_demo.py> ###############################
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#################### EXAMPLE DEMO <ex_demo.py> ###############################
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'''A simple interactive demo to illustrate the use of IPython's Demo class.'''
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'''A simple interactive demo to illustrate the use of IPython's Demo class.'''
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print 'Hello, welcome to an interactive IPython demo.'
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print 'Hello, welcome to an interactive IPython demo.'
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# The mark below defines a block boundary, which is a point where IPython will
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# The mark below defines a block boundary, which is a point where IPython will
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# stop execution and return to the interactive prompt. The dashes are actually
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# stop execution and return to the interactive prompt. The dashes are actually
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# optional and used only as a visual aid to clearly separate blocks while
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# optional and used only as a visual aid to clearly separate blocks while
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editing the demo code.
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# editing the demo code.
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# <demo> stop
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# <demo> stop
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x = 1
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x = 1
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y = 2
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y = 2
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# <demo> stop
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# <demo> stop
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# the mark below makes this block as silent
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# the mark below makes this block as silent
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# <demo> silent
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# <demo> silent
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print 'This is a silent block, which gets executed but not printed.'
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print 'This is a silent block, which gets executed but not printed.'
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# <demo> stop
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# <demo> stop
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# <demo> auto
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# <demo> auto
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print 'This is an automatic block.'
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print 'This is an automatic block.'
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print 'It is executed without asking for confirmation, but printed.'
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print 'It is executed without asking for confirmation, but printed.'
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z = x+y
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z = x+y
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print 'z=',x
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print 'z=',x
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# <demo> stop
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# <demo> stop
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# This is just another normal block.
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# This is just another normal block.
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print 'z is now:', z
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print 'z is now:', z
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print 'bye!'
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print 'bye!'
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################### END EXAMPLE DEMO <ex_demo.py> ############################
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################### END EXAMPLE DEMO <ex_demo.py> ############################
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"""
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"""
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#*****************************************************************************
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#*****************************************************************************
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# Copyright (C) 2005-2006 Fernando Perez. <Fernando.Perez@colorado.edu>
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# Copyright (C) 2005-2006 Fernando Perez. <Fernando.Perez@colorado.edu>
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#
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#
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# Distributed under the terms of the BSD License. The full license is in
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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# the file COPYING, distributed as part of this software.
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#
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#
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#*****************************************************************************
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#*****************************************************************************
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import exceptions
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import exceptions
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import os
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import os
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import re
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import re
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import shlex
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import shlex
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import sys
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import sys
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from IPython.PyColorize import Parser
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from IPython.PyColorize import Parser
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from IPython.genutils import marquee, file_read, file_readlines
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from IPython.genutils import marquee, file_read, file_readlines
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from genutils import Term
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__all__ = ['Demo','IPythonDemo','LineDemo','IPythonLineDemo','DemoError']
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__all__ = ['Demo','IPythonDemo','LineDemo','IPythonLineDemo','DemoError']
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class DemoError(exceptions.Exception): pass
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class DemoError(exceptions.Exception): pass
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def re_mark(mark):
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def re_mark(mark):
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return re.compile(r'^\s*#\s+<demo>\s+%s\s*$' % mark,re.MULTILINE)
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return re.compile(r'^\s*#\s+<demo>\s+%s\s*$' % mark,re.MULTILINE)
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class Demo(object):
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class Demo(object):
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re_stop = re_mark('-*\s?stop\s?-*')
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re_stop = re_mark('-*\s?stop\s?-*')
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re_silent = re_mark('silent')
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re_silent = re_mark('silent')
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re_auto = re_mark('auto')
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re_auto = re_mark('auto')
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re_auto_all = re_mark('auto_all')
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re_auto_all = re_mark('auto_all')
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def __init__(self,fname,arg_str='',auto_all=None):
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def __init__(self,src,title='',arg_str='',auto_all=None):
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"""Make a new demo object. To run the demo, simply call the object.
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"""Make a new demo object. To run the demo, simply call the object.
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See the module docstring for full details and an example (you can use
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See the module docstring for full details and an example (you can use
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IPython.Demo? in IPython to see it).
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IPython.Demo? in IPython to see it).
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Inputs:
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Inputs:
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- fname = filename.
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- src is either a file, or file-like object, or a
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string that can be resolved to a filename.
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Optional inputs:
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Optional inputs:
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- title: a string to use as the demo name. Of most use when the demo
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you are making comes from an object that has no filename, or if you
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want an alternate denotation distinct from the filename.
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- arg_str(''): a string of arguments, internally converted to a list
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- arg_str(''): a string of arguments, internally converted to a list
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just like sys.argv, so the demo script can see a similar
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just like sys.argv, so the demo script can see a similar
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environment.
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environment.
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- auto_all(None): global flag to run all blocks automatically without
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- auto_all(None): global flag to run all blocks automatically without
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confirmation. This attribute overrides the block-level tags and
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confirmation. This attribute overrides the block-level tags and
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applies to the whole demo. It is an attribute of the object, and
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applies to the whole demo. It is an attribute of the object, and
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can be changed at runtime simply by reassigning it to a boolean
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can be changed at runtime simply by reassigning it to a boolean
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value.
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value.
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"""
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"""
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if hasattr(src, "read"):
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self.fname = fname
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# It seems to be a file or a file-like object
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self.sys_argv = [fname] + shlex.split(arg_str)
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self.fobj = src
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self.fname = "from a file-like object"
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if title == '':
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self.title = "from a file-like object"
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else:
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self.title = title
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else:
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# Assume it's a string or something that can be converted to one
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self.fobj = open(src)
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self.fname = src
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if title == '':
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(filepath, filename) = os.path.split(src)
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self.title = filename
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else:
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self.title = title
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self.sys_argv = [src] + shlex.split(arg_str)
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self.auto_all = auto_all
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self.auto_all = auto_all
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# get a few things from ipython. While it's a bit ugly design-wise,
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# get a few things from ipython. While it's a bit ugly design-wise,
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# it ensures that things like color scheme and the like are always in
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# it ensures that things like color scheme and the like are always in
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# sync with the ipython mode being used. This class is only meant to
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# sync with the ipython mode being used. This class is only meant to
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# be used inside ipython anyways, so it's OK.
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# be used inside ipython anyways, so it's OK.
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self.ip_ns = __IPYTHON__.user_ns
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self.ip_ns = __IPYTHON__.user_ns
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self.ip_colorize = __IPYTHON__.pycolorize
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self.ip_colorize = __IPYTHON__.pycolorize
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self.ip_showtb = __IPYTHON__.showtraceback
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self.ip_showtb = __IPYTHON__.showtraceback
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self.ip_runlines = __IPYTHON__.runlines
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self.ip_runlines = __IPYTHON__.runlines
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self.shell = __IPYTHON__
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self.shell = __IPYTHON__
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# load user data and initialize data structures
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# load user data and initialize data structures
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self.reload()
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self.reload()
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def reload(self):
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def reload(self):
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"""Reload source from disk and initialize state."""
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"""Reload source from disk and initialize state."""
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# read data and parse into blocks
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# read data and parse into blocks
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self.src = file_read(self.fname)
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self.src = self.fobj.read()
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src_b = [b.strip() for b in self.re_stop.split(self.src) if b]
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src_b = [b.strip() for b in self.re_stop.split(self.src) if b]
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self._silent = [bool(self.re_silent.findall(b)) for b in src_b]
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self._silent = [bool(self.re_silent.findall(b)) for b in src_b]
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self._auto = [bool(self.re_auto.findall(b)) for b in src_b]
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self._auto = [bool(self.re_auto.findall(b)) for b in src_b]
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# if auto_all is not given (def. None), we read it from the file
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# if auto_all is not given (def. None), we read it from the file
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if self.auto_all is None:
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|
if self.auto_all is None:
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|
self.auto_all = bool(self.re_auto_all.findall(src_b[0]))
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self.auto_all = bool(self.re_auto_all.findall(src_b[0]))
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else:
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else:
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self.auto_all = bool(self.auto_all)
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|
self.auto_all = bool(self.auto_all)
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# Clean the sources from all markup so it doesn't get displayed when
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# Clean the sources from all markup so it doesn't get displayed when
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# running the demo
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# running the demo
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src_blocks = []
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src_blocks = []
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auto_strip = lambda s: self.re_auto.sub('',s)
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|
auto_strip = lambda s: self.re_auto.sub('',s)
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|
for i,b in enumerate(src_b):
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for i,b in enumerate(src_b):
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if self._auto[i]:
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272
|
if self._auto[i]:
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src_blocks.append(auto_strip(b))
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src_blocks.append(auto_strip(b))
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|
else:
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|
else:
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|
src_blocks.append(b)
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|
src_blocks.append(b)
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|
# remove the auto_all marker
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|
# remove the auto_all marker
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|
src_blocks[0] = self.re_auto_all.sub('',src_blocks[0])
|
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277
|
src_blocks[0] = self.re_auto_all.sub('',src_blocks[0])
|
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253
|
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278
|
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254
|
self.nblocks = len(src_blocks)
|
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279
|
self.nblocks = len(src_blocks)
|
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255
|
self.src_blocks = src_blocks
|
|
280
|
self.src_blocks = src_blocks
|
|
256
|
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281
|
|
|
257
|
# also build syntax-highlighted source
|
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282
|
# also build syntax-highlighted source
|
|
258
|
self.src_blocks_colored = map(self.ip_colorize,self.src_blocks)
|
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283
|
self.src_blocks_colored = map(self.ip_colorize,self.src_blocks)
|
|
259
|
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284
|
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260
|
# ensure clean namespace and seek offset
|
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|
# ensure clean namespace and seek offset
|
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|
self.reset()
|
|
286
|
self.reset()
|
|
262
|
|
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287
|
|
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263
|
def reset(self):
|
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288
|
def reset(self):
|
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264
|
"""Reset the namespace and seek pointer to restart the demo"""
|
|
289
|
"""Reset the namespace and seek pointer to restart the demo"""
|
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265
|
self.user_ns = {}
|
|
290
|
self.user_ns = {}
|
|
266
|
self.finished = False
|
|
291
|
self.finished = False
|
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267
|
self.block_index = 0
|
|
292
|
self.block_index = 0
|
|
268
|
|
|
293
|
|
|
269
|
def _validate_index(self,index):
|
|
294
|
def _validate_index(self,index):
|
|
270
|
if index<0 or index>=self.nblocks:
|
|
295
|
if index<0 or index>=self.nblocks:
|
|
271
|
raise ValueError('invalid block index %s' % index)
|
|
296
|
raise ValueError('invalid block index %s' % index)
|
|
272
|
|
|
297
|
|
|
273
|
def _get_index(self,index):
|
|
298
|
def _get_index(self,index):
|
|
274
|
"""Get the current block index, validating and checking status.
|
|
299
|
"""Get the current block index, validating and checking status.
|
|
275
|
|
|
300
|
|
|
276
|
Returns None if the demo is finished"""
|
|
301
|
Returns None if the demo is finished"""
|
|
277
|
|
|
302
|
|
|
278
|
if index is None:
|
|
303
|
if index is None:
|
|
279
|
if self.finished:
|
|
304
|
if self.finished:
|
|
280
|
print 'Demo finished. Use reset() if you want to rerun it.'
|
|
305
|
print >>Term.cout, 'Demo finished. Use <demo_name>.reset() if you want to rerun it.'
|
|
281
|
return None
|
|
306
|
return None
|
|
282
|
index = self.block_index
|
|
307
|
index = self.block_index
|
|
283
|
else:
|
|
308
|
else:
|
|
284
|
self._validate_index(index)
|
|
309
|
self._validate_index(index)
|
|
285
|
return index
|
|
310
|
return index
|
|
286
|
|
|
311
|
|
|
287
|
def seek(self,index):
|
|
312
|
def seek(self,index):
|
|
288
|
"""Move the current seek pointer to the given block.
|
|
313
|
"""Move the current seek pointer to the given block.
|
|
289
|
|
|
314
|
|
|
290
|
You can use negative indices to seek from the end, with identical
|
|
315
|
You can use negative indices to seek from the end, with identical
|
|
291
|
semantics to those of Python lists."""
|
|
316
|
semantics to those of Python lists."""
|
|
292
|
if index<0:
|
|
317
|
if index<0:
|
|
293
|
index = self.nblocks + index
|
|
318
|
index = self.nblocks + index
|
|
294
|
self._validate_index(index)
|
|
319
|
self._validate_index(index)
|
|
295
|
self.block_index = index
|
|
320
|
self.block_index = index
|
|
296
|
self.finished = False
|
|
321
|
self.finished = False
|
|
297
|
|
|
322
|
|
|
298
|
def back(self,num=1):
|
|
323
|
def back(self,num=1):
|
|
299
|
"""Move the seek pointer back num blocks (default is 1)."""
|
|
324
|
"""Move the seek pointer back num blocks (default is 1)."""
|
|
300
|
self.seek(self.block_index-num)
|
|
325
|
self.seek(self.block_index-num)
|
|
301
|
|
|
326
|
|
|
302
|
def jump(self,num=1):
|
|
327
|
def jump(self,num=1):
|
|
303
|
"""Jump a given number of blocks relative to the current one.
|
|
328
|
"""Jump a given number of blocks relative to the current one.
|
|
304
|
|
|
329
|
|
|
305
|
The offset can be positive or negative, defaults to 1."""
|
|
330
|
The offset can be positive or negative, defaults to 1."""
|
|
306
|
self.seek(self.block_index+num)
|
|
331
|
self.seek(self.block_index+num)
|
|
307
|
|
|
332
|
|
|
308
|
def again(self):
|
|
333
|
def again(self):
|
|
309
|
"""Move the seek pointer back one block and re-execute."""
|
|
334
|
"""Move the seek pointer back one block and re-execute."""
|
|
310
|
self.back(1)
|
|
335
|
self.back(1)
|
|
311
|
self()
|
|
336
|
self()
|
|
312
|
|
|
337
|
|
|
313
|
def edit(self,index=None):
|
|
338
|
def edit(self,index=None):
|
|
314
|
"""Edit a block.
|
|
339
|
"""Edit a block.
|
|
315
|
|
|
340
|
|
|
316
|
If no number is given, use the last block executed.
|
|
341
|
If no number is given, use the last block executed.
|
|
317
|
|
|
342
|
|
|
318
|
This edits the in-memory copy of the demo, it does NOT modify the
|
|
343
|
This edits the in-memory copy of the demo, it does NOT modify the
|
|
319
|
original source file. If you want to do that, simply open the file in
|
|
344
|
original source file. If you want to do that, simply open the file in
|
|
320
|
an editor and use reload() when you make changes to the file. This
|
|
345
|
an editor and use reload() when you make changes to the file. This
|
|
321
|
method is meant to let you change a block during a demonstration for
|
|
346
|
method is meant to let you change a block during a demonstration for
|
|
322
|
explanatory purposes, without damaging your original script."""
|
|
347
|
explanatory purposes, without damaging your original script."""
|
|
323
|
|
|
348
|
|
|
324
|
index = self._get_index(index)
|
|
349
|
index = self._get_index(index)
|
|
325
|
if index is None:
|
|
350
|
if index is None:
|
|
326
|
return
|
|
351
|
return
|
|
327
|
# decrease the index by one (unless we're at the very beginning), so
|
|
352
|
# decrease the index by one (unless we're at the very beginning), so
|
|
328
|
# that the default demo.edit() call opens up the sblock we've last run
|
|
353
|
# that the default demo.edit() call opens up the sblock we've last run
|
|
329
|
if index>0:
|
|
354
|
if index>0:
|
|
330
|
index -= 1
|
|
355
|
index -= 1
|
|
331
|
|
|
356
|
|
|
332
|
filename = self.shell.mktempfile(self.src_blocks[index])
|
|
357
|
filename = self.shell.mktempfile(self.src_blocks[index])
|
|
333
|
self.shell.hooks.editor(filename,1)
|
|
358
|
self.shell.hooks.editor(filename,1)
|
|
334
|
new_block = file_read(filename)
|
|
359
|
new_block = file_read(filename)
|
|
335
|
# update the source and colored block
|
|
360
|
# update the source and colored block
|
|
336
|
self.src_blocks[index] = new_block
|
|
361
|
self.src_blocks[index] = new_block
|
|
337
|
self.src_blocks_colored[index] = self.ip_colorize(new_block)
|
|
362
|
self.src_blocks_colored[index] = self.ip_colorize(new_block)
|
|
338
|
self.block_index = index
|
|
363
|
self.block_index = index
|
|
339
|
# call to run with the newly edited index
|
|
364
|
# call to run with the newly edited index
|
|
340
|
self()
|
|
365
|
self()
|
|
341
|
|
|
366
|
|
|
342
|
def show(self,index=None):
|
|
367
|
def show(self,index=None):
|
|
343
|
"""Show a single block on screen"""
|
|
368
|
"""Show a single block on screen"""
|
|
344
|
|
|
369
|
|
|
345
|
index = self._get_index(index)
|
|
370
|
index = self._get_index(index)
|
|
346
|
if index is None:
|
|
371
|
if index is None:
|
|
347
|
return
|
|
372
|
return
|
|
348
|
|
|
373
|
|
|
349
|
print self.marquee('<%s> block # %s (%s remaining)' %
|
|
374
|
print >>Term.cout, self.marquee('<%s> block # %s (%s remaining)' %
|
|
350
|
(self.fname,index,self.nblocks-index-1))
|
|
375
|
(self.title,index,self.nblocks-index-1))
|
|
351
|
sys.stdout.write(self.src_blocks_colored[index])
|
|
376
|
print >>Term.cout,(self.src_blocks_colored[index])
|
|
352
|
sys.stdout.flush()
|
|
377
|
sys.stdout.flush()
|
|
353
|
|
|
378
|
|
|
354
|
def show_all(self):
|
|
379
|
def show_all(self):
|
|
355
|
"""Show entire demo on screen, block by block"""
|
|
380
|
"""Show entire demo on screen, block by block"""
|
|
356
|
|
|
381
|
|
|
357
|
fname = self.fname
|
|
382
|
fname = self.title
|
|
|
|
|
383
|
title = self.title
|
|
358
|
nblocks = self.nblocks
|
|
384
|
nblocks = self.nblocks
|
|
359
|
silent = self._silent
|
|
385
|
silent = self._silent
|
|
360
|
marquee = self.marquee
|
|
386
|
marquee = self.marquee
|
|
361
|
for index,block in enumerate(self.src_blocks_colored):
|
|
387
|
for index,block in enumerate(self.src_blocks_colored):
|
|
362
|
if silent[index]:
|
|
388
|
if silent[index]:
|
|
363
|
print marquee('<%s> SILENT block # %s (%s remaining)' %
|
|
389
|
print >>Term.cout, marquee('<%s> SILENT block # %s (%s remaining)' %
|
|
364
|
(fname,index,nblocks-index-1))
|
|
390
|
(title,index,nblocks-index-1))
|
|
365
|
else:
|
|
391
|
else:
|
|
366
|
print marquee('<%s> block # %s (%s remaining)' %
|
|
392
|
print >>Term.cout, marquee('<%s> block # %s (%s remaining)' %
|
|
367
|
(fname,index,nblocks-index-1))
|
|
393
|
(title,index,nblocks-index-1))
|
|
368
|
print block,
|
|
394
|
print >>Term.cout, block,
|
|
369
|
sys.stdout.flush()
|
|
395
|
sys.stdout.flush()
|
|
370
|
|
|
396
|
|
|
371
|
def runlines(self,source):
|
|
397
|
def runlines(self,source):
|
|
372
|
"""Execute a string with one or more lines of code"""
|
|
398
|
"""Execute a string with one or more lines of code"""
|
|
373
|
|
|
399
|
|
|
374
|
exec source in self.user_ns
|
|
400
|
exec source in self.user_ns
|
|
375
|
|
|
401
|
|
|
376
|
def __call__(self,index=None):
|
|
402
|
def __call__(self,index=None):
|
|
377
|
"""run a block of the demo.
|
|
403
|
"""run a block of the demo.
|
|
378
|
|
|
404
|
|
|
379
|
If index is given, it should be an integer >=1 and <= nblocks. This
|
|
405
|
If index is given, it should be an integer >=1 and <= nblocks. This
|
|
380
|
means that the calling convention is one off from typical Python
|
|
406
|
means that the calling convention is one off from typical Python
|
|
381
|
lists. The reason for the inconsistency is that the demo always
|
|
407
|
lists. The reason for the inconsistency is that the demo always
|
|
382
|
prints 'Block n/N, and N is the total, so it would be very odd to use
|
|
408
|
prints 'Block n/N, and N is the total, so it would be very odd to use
|
|
383
|
zero-indexing here."""
|
|
409
|
zero-indexing here."""
|
|
384
|
|
|
410
|
|
|
385
|
index = self._get_index(index)
|
|
411
|
index = self._get_index(index)
|
|
386
|
if index is None:
|
|
412
|
if index is None:
|
|
387
|
return
|
|
413
|
return
|
|
388
|
try:
|
|
414
|
try:
|
|
389
|
marquee = self.marquee
|
|
415
|
marquee = self.marquee
|
|
390
|
next_block = self.src_blocks[index]
|
|
416
|
next_block = self.src_blocks[index]
|
|
391
|
self.block_index += 1
|
|
417
|
self.block_index += 1
|
|
392
|
if self._silent[index]:
|
|
418
|
if self._silent[index]:
|
|
393
|
print marquee('Executing silent block # %s (%s remaining)' %
|
|
419
|
print >>Term.cout, marquee('Executing silent block # %s (%s remaining)' %
|
|
394
|
(index,self.nblocks-index-1))
|
|
420
|
(index,self.nblocks-index-1))
|
|
395
|
else:
|
|
421
|
else:
|
|
396
|
self.pre_cmd()
|
|
422
|
self.pre_cmd()
|
|
397
|
self.show(index)
|
|
423
|
self.show(index)
|
|
398
|
if self.auto_all or self._auto[index]:
|
|
424
|
if self.auto_all or self._auto[index]:
|
|
399
|
print marquee('output:')
|
|
425
|
print >>Term.cout, marquee('output:')
|
|
400
|
else:
|
|
426
|
else:
|
|
401
|
print marquee('Press <q> to quit, <Enter> to execute...'),
|
|
427
|
print >>Term.cout, marquee('Press <q> to quit, <Enter> to execute...'),
|
|
402
|
ans = raw_input().strip()
|
|
428
|
ans = raw_input().strip()
|
|
403
|
if ans:
|
|
429
|
if ans:
|
|
404
|
print marquee('Block NOT executed')
|
|
430
|
print >>Term.cout, marquee('Block NOT executed')
|
|
405
|
return
|
|
431
|
return
|
|
406
|
try:
|
|
432
|
try:
|
|
407
|
save_argv = sys.argv
|
|
433
|
save_argv = sys.argv
|
|
408
|
sys.argv = self.sys_argv
|
|
434
|
sys.argv = self.sys_argv
|
|
409
|
self.runlines(next_block)
|
|
435
|
self.runlines(next_block)
|
|
410
|
self.post_cmd()
|
|
436
|
self.post_cmd()
|
|
411
|
finally:
|
|
437
|
finally:
|
|
412
|
sys.argv = save_argv
|
|
438
|
sys.argv = save_argv
|
|
413
|
|
|
439
|
|
|
414
|
except:
|
|
440
|
except:
|
|
415
|
self.ip_showtb(filename=self.fname)
|
|
441
|
self.ip_showtb(filename=self.fname)
|
|
416
|
else:
|
|
442
|
else:
|
|
417
|
self.ip_ns.update(self.user_ns)
|
|
443
|
self.ip_ns.update(self.user_ns)
|
|
418
|
|
|
444
|
|
|
419
|
if self.block_index == self.nblocks:
|
|
445
|
if self.block_index == self.nblocks:
|
|
420
|
mq1 = self.marquee('END OF DEMO')
|
|
446
|
mq1 = self.marquee('END OF DEMO')
|
|
421
|
if mq1:
|
|
447
|
if mq1:
|
|
422
|
# avoid spurious prints if empty marquees are used
|
|
448
|
# avoid spurious print >>Term.cout,s if empty marquees are used
|
|
423
|
print
|
|
449
|
print >>Term.cout
|
|
424
|
print mq1
|
|
450
|
print >>Term.cout, mq1
|
|
425
|
print self.marquee('Use reset() if you want to rerun it.')
|
|
451
|
print >>Term.cout, self.marquee('Use <demo_name>.reset() if you want to rerun it.')
|
|
426
|
self.finished = True
|
|
452
|
self.finished = True
|
|
427
|
|
|
453
|
|
|
428
|
# These methods are meant to be overridden by subclasses who may wish to
|
|
454
|
# These methods are meant to be overridden by subclasses who may wish to
|
|
429
|
# customize the behavior of of their demos.
|
|
455
|
# customize the behavior of of their demos.
|
|
430
|
def marquee(self,txt='',width=78,mark='*'):
|
|
456
|
def marquee(self,txt='',width=78,mark='*'):
|
|
431
|
"""Return the input string centered in a 'marquee'."""
|
|
457
|
"""Return the input string centered in a 'marquee'."""
|
|
432
|
return marquee(txt,width,mark)
|
|
458
|
return marquee(txt,width,mark)
|
|
433
|
|
|
459
|
|
|
434
|
def pre_cmd(self):
|
|
460
|
def pre_cmd(self):
|
|
435
|
"""Method called before executing each block."""
|
|
461
|
"""Method called before executing each block."""
|
|
436
|
pass
|
|
462
|
pass
|
|
437
|
|
|
463
|
|
|
438
|
def post_cmd(self):
|
|
464
|
def post_cmd(self):
|
|
439
|
"""Method called after executing each block."""
|
|
465
|
"""Method called after executing each block."""
|
|
440
|
pass
|
|
466
|
pass
|
|
441
|
|
|
467
|
|
|
442
|
|
|
468
|
|
|
443
|
class IPythonDemo(Demo):
|
|
469
|
class IPythonDemo(Demo):
|
|
444
|
"""Class for interactive demos with IPython's input processing applied.
|
|
470
|
"""Class for interactive demos with IPython's input processing applied.
|
|
445
|
|
|
471
|
|
|
446
|
This subclasses Demo, but instead of executing each block by the Python
|
|
472
|
This subclasses Demo, but instead of executing each block by the Python
|
|
447
|
interpreter (via exec), it actually calls IPython on it, so that any input
|
|
473
|
interpreter (via exec), it actually calls IPython on it, so that any input
|
|
448
|
filters which may be in place are applied to the input block.
|
|
474
|
filters which may be in place are applied to the input block.
|
|
449
|
|
|
475
|
|
|
450
|
If you have an interactive environment which exposes special input
|
|
476
|
If you have an interactive environment which exposes special input
|
|
451
|
processing, you can use this class instead to write demo scripts which
|
|
477
|
processing, you can use this class instead to write demo scripts which
|
|
452
|
operate exactly as if you had typed them interactively. The default Demo
|
|
478
|
operate exactly as if you had typed them interactively. The default Demo
|
|
453
|
class requires the input to be valid, pure Python code.
|
|
479
|
class requires the input to be valid, pure Python code.
|
|
454
|
"""
|
|
480
|
"""
|
|
455
|
|
|
481
|
|
|
456
|
def runlines(self,source):
|
|
482
|
def runlines(self,source):
|
|
457
|
"""Execute a string with one or more lines of code"""
|
|
483
|
"""Execute a string with one or more lines of code"""
|
|
458
|
|
|
484
|
|
|
459
|
self.shell.runlines(source)
|
|
485
|
self.shell.runlines(source)
|
|
460
|
|
|
486
|
|
|
461
|
class LineDemo(Demo):
|
|
487
|
class LineDemo(Demo):
|
|
462
|
"""Demo where each line is executed as a separate block.
|
|
488
|
"""Demo where each line is executed as a separate block.
|
|
463
|
|
|
489
|
|
|
464
|
The input script should be valid Python code.
|
|
490
|
The input script should be valid Python code.
|
|
465
|
|
|
491
|
|
|
466
|
This class doesn't require any markup at all, and it's meant for simple
|
|
492
|
This class doesn't require any markup at all, and it's meant for simple
|
|
467
|
scripts (with no nesting or any kind of indentation) which consist of
|
|
493
|
scripts (with no nesting or any kind of indentation) which consist of
|
|
468
|
multiple lines of input to be executed, one at a time, as if they had been
|
|
494
|
multiple lines of input to be executed, one at a time, as if they had been
|
|
469
|
typed in the interactive prompt."""
|
|
495
|
typed in the interactive prompt."""
|
|
470
|
|
|
496
|
|
|
471
|
def reload(self):
|
|
497
|
def reload(self):
|
|
472
|
"""Reload source from disk and initialize state."""
|
|
498
|
"""Reload source from disk and initialize state."""
|
|
473
|
# read data and parse into blocks
|
|
499
|
# read data and parse into blocks
|
|
474
|
src_b = [l for l in file_readlines(self.fname) if l.strip()]
|
|
500
|
src_b = [l for l in self.fobj.readline() if l.strip()]
|
|
475
|
nblocks = len(src_b)
|
|
501
|
nblocks = len(src_b)
|
|
476
|
self.src = os.linesep.join(file_readlines(self.fname))
|
|
502
|
self.src = os.linesep.join(self.fobj.readlines())
|
|
477
|
self._silent = [False]*nblocks
|
|
503
|
self._silent = [False]*nblocks
|
|
478
|
self._auto = [True]*nblocks
|
|
504
|
self._auto = [True]*nblocks
|
|
479
|
self.auto_all = True
|
|
505
|
self.auto_all = True
|
|
480
|
self.nblocks = nblocks
|
|
506
|
self.nblocks = nblocks
|
|
481
|
self.src_blocks = src_b
|
|
507
|
self.src_blocks = src_b
|
|
482
|
|
|
508
|
|
|
483
|
# also build syntax-highlighted source
|
|
509
|
# also build syntax-highlighted source
|
|
484
|
self.src_blocks_colored = map(self.ip_colorize,self.src_blocks)
|
|
510
|
self.src_blocks_colored = map(self.ip_colorize,self.src_blocks)
|
|
485
|
|
|
511
|
|
|
486
|
# ensure clean namespace and seek offset
|
|
512
|
# ensure clean namespace and seek offset
|
|
487
|
self.reset()
|
|
513
|
self.reset()
|
|
488
|
|
|
514
|
|
|
489
|
|
|
515
|
|
|
490
|
class IPythonLineDemo(IPythonDemo,LineDemo):
|
|
516
|
class IPythonLineDemo(IPythonDemo,LineDemo):
|
|
491
|
"""Variant of the LineDemo class whose input is processed by IPython."""
|
|
517
|
"""Variant of the LineDemo class whose input is processed by IPython."""
|
|
492
|
pass
|
|
518
|
pass
|
|
493
|
|
|
519
|
|
|
494
|
|
|
520
|
|
|
495
|
class ClearMixin(object):
|
|
521
|
class ClearMixin(object):
|
|
496
|
"""Use this mixin to make Demo classes with less visual clutter.
|
|
522
|
"""Use this mixin to make Demo classes with less visual clutter.
|
|
497
|
|
|
523
|
|
|
498
|
Demos using this mixin will clear the screen before every block and use
|
|
524
|
Demos using this mixin will clear the screen before every block and use
|
|
499
|
blank marquees.
|
|
525
|
blank marquees.
|
|
500
|
|
|
526
|
|
|
501
|
Note that in order for the methods defined here to actually override those
|
|
527
|
Note that in order for the methods defined here to actually override those
|
|
502
|
of the classes it's mixed with, it must go /first/ in the inheritance
|
|
528
|
of the classes it's mixed with, it must go /first/ in the inheritance
|
|
503
|
tree. For example:
|
|
529
|
tree. For example:
|
|
504
|
|
|
530
|
|
|
505
|
class ClearIPDemo(ClearMixin,IPythonDemo): pass
|
|
531
|
class ClearIPDemo(ClearMixin,IPythonDemo): pass
|
|
506
|
|
|
532
|
|
|
507
|
will provide an IPythonDemo class with the mixin's features.
|
|
533
|
will provide an IPythonDemo class with the mixin's features.
|
|
508
|
"""
|
|
534
|
"""
|
|
509
|
|
|
535
|
|
|
510
|
def marquee(self,txt='',width=78,mark='*'):
|
|
536
|
def marquee(self,txt='',width=78,mark='*'):
|
|
511
|
"""Blank marquee that returns '' no matter what the input."""
|
|
537
|
"""Blank marquee that returns '' no matter what the input."""
|
|
512
|
return ''
|
|
538
|
return ''
|
|
513
|
|
|
539
|
|
|
514
|
def pre_cmd(self):
|
|
540
|
def pre_cmd(self):
|
|
515
|
"""Method called before executing each block.
|
|
541
|
"""Method called before executing each block.
|
|
516
|
|
|
542
|
|
|
517
|
This one simply clears the screen."""
|
|
543
|
This one simply clears the screen."""
|
|
518
|
os.system('clear')
|
|
544
|
import IPython.platutils
|
|
519
|
|
|
545
|
IPython.platutils.term_clear()
|
|
520
|
|
|
546
|
|
|
521
|
class ClearDemo(ClearMixin,Demo):
|
|
547
|
class ClearDemo(ClearMixin,Demo):
|
|
522
|
pass
|
|
548
|
pass
|
|
523
|
|
|
549
|
|
|
524
|
|
|
550
|
|
|
525
|
class ClearIPDemo(ClearMixin,IPythonDemo):
|
|
551
|
class ClearIPDemo(ClearMixin,IPythonDemo):
|
|
526
|
pass
|
|
552
|
pass
|