upstream/ipython Files · docs/examples/core/example-demo.py

Move crash handling to the application level and simplify class structure....

Move crash handling to the application level and simplify class structure. Starting to try to take real advantage of the refactoring, to have generic crash handling. This also lets us initialize the app without needing all the self.attempt() wrappers, since now there's a good system-wide crash handler at the app level (not inside the shell instance). I didn't yet remove the attempt() method because we may have occasional uses for it (we still do, but in one place only). I also removed some extra class layers that weren't quite needed. Creating classes solely for the purpose of passing parameters makes the code (IMO) harder to understand, I kept getting lost in parts of the class hierarchy. I think these changes provide the same flexibility but with easier to follow code (less things to remember, basically). What I tried to do was to use argument passing instead of inheritance for all cases I saw where the inheritance wasn't really adding new functionality. In some cases, this actually allowed me to remove methods that were effectively duplicated in the subclasses.

Brian E Granger - - Load All Authors

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      """A simple interactive demo to illustrate the use of IPython's Demo class.

      Any python script can be run as a demo, but that does little more than showing

      it on-screen, syntax-highlighted in one shot.  If you add a little simple

      markup, you can stop at specified intervals and return to the ipython prompt,

      resuming execution later.

      """

      print 'Hello, welcome to an interactive IPython demo.'

      print 'Executing this block should require confirmation before proceeding,'

      print 'unless auto_all has been set to true in the demo object'

      # The mark below defines a block boundary, which is a point where IPython will

      # stop execution and return to the interactive prompt.

      # Note that in actual interactive execution, 

      # <demo> --- stop ---

      x = 1

      y = 2

      # <demo> --- stop ---

      # the mark below makes this block as silent

      # <demo> silent

      print 'This is a silent block, which gets executed but not printed.'

      # <demo> --- stop ---

      # <demo> auto

      print 'This is an automatic block.'

      print 'It is executed without asking for confirmation, but printed.'

      z = x+y

      print 'z=',x

      # <demo> --- stop ---

      # This is just another normal block.

      print 'z is now:', z

      print 'bye!'

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				"""A simple interactive demo to illustrate the use of IPython's Demo class.

				Any python script can be run as a demo, but that does little more than showing
				it on-screen, syntax-highlighted in one shot. If you add a little simple
				markup, you can stop at specified intervals and return to the ipython prompt,
				resuming execution later.
				"""

				print 'Hello, welcome to an interactive IPython demo.'
				print 'Executing this block should require confirmation before proceeding,'
				print 'unless auto_all has been set to true in the demo object'

				# The mark below defines a block boundary, which is a point where IPython will
				# stop execution and return to the interactive prompt.
				# Note that in actual interactive execution,
				# <demo> --- stop ---

				x = 1
				y = 2

				# <demo> --- stop ---

				# the mark below makes this block as silent
				# <demo> silent

				print 'This is a silent block, which gets executed but not printed.'

				# <demo> --- stop ---
				# <demo> auto
				print 'This is an automatic block.'
				print 'It is executed without asking for confirmation, but printed.'
				z = x+y

				print 'z=',x

				# <demo> --- stop ---
				# This is just another normal block.
				print 'z is now:', z

				print 'bye!'