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b' language and what are the specific construct you can do only in IPython.'
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Unless expressed otherwise all of the construct you will see here will raise a
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Unless expressed otherwise all of the construct you will see here will raise a
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``SyntaxError`` if run in a pure Python shell, or if executing in a Python
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``SyntaxError`` if run in a pure Python shell, or if executing in a Python
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script.
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script.
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Each of these features are describe more in details in further part of the documentation.
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Each of these features are describe more in details in further part of the documentation.
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b' All the following construct are valid IPython syntax:'
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In [1]: %%perl magic --function
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In [1]: %%perl magic --function
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...: @months = ("July", "August", "September");
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...: @months = ("July", "August", "September");
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...: print $months[0];
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...: print $months[0];
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Each of these construct is compile by IPython into valid python code and will
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Each of these construct is compile by IPython into valid python code and will
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do most of the time what you expect it will do. Let see each of these example
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do most of the time what you expect it will do. Let see each of these example
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b' namespace will show help relative to this object:'
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A double question mark will try to pull out more information about the object,
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A double question mark will try to pull out more information about the object,
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and if possible display the python source code of this object.
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and if possible display the python source code of this object.
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.. code-block:: ipython
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.. code-block:: ipython
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b' Shell Assignment'
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When doing interactive computing it is common to need to access the underlying shell.
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When doing interactive computing it is common to need to access the underlying shell.
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This is doable through the use of the exclamation mark ``!`` (or bang).
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This is doable through the use of the exclamation mark ``!`` (or bang).
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This allow to execute simple command when present in beginning of line:
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This allow to execute simple command when present in beginning of line:
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b' The later form of expansion supports arbitrary python expression:'
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The bang can also be present in the right hand side of an assignment, just
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The bang can also be present in the right hand side of an assignment, just
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after the equal sign, or separated from it by a white space. In which case the
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after the equal sign, or separated from it by a white space. In which case the
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standard output of the command after the bang ``!`` will be split out into lines
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standard output of the command after the bang ``!`` will be split out into lines
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in a list-like object (:see:`IPython Slist`) and assign to the left hand side.
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in a list-like object (:ref:`IPython Slist`) and assign to the left hand side.
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This allow you for example to put the list of files of the current working directory in a variable:
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This allow you for example to put the list of files of the current working directory in a variable:
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b' Magics'
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Magics function are often present in the form of shell-like syntax, but are
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Magics function are often present in the form of shell-like syntax, but are
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under the hood python function. The syntax and assignment possibility are
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under the hood python function. The syntax and assignment possibility are
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similar to the one with the bang (``!``) syntax, but with more flexibility and
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similar to the one with the bang (``!``) syntax, but with more flexibility and
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power. Magic function start with a percent sign (``%``) or double percent (``%%``).
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power. Magic function start with a percent sign (``%``) or double percent (``%%``).
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A magic call with a sign percent will act only one line:
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A magic call with a sign percent will act only one line:
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