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.. _extensions_overview:
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==================
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IPython extensions
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==================
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Configuration files are just the first level of customization that IPython
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supports. The next level is that of extensions. An IPython extension is an
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importable Python module that has a a few special function. By defining these
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functions, users can customize IPython by accessing the actual runtime objects
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of IPython. Here is a sample extension::
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# myextension.py
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def load_ipython_extension(ipython):
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# The ``ipython`` argument is the currently active
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# :class:`InteractiveShell` instance that can be used in any way.
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# This allows you do to things like register new magics, plugins or
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# aliases.
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def unload_ipython_extension(ipython):
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# If you want your extension to be unloadable, put that logic here.
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This :func:`load_ipython_extension` function is called after your extension is
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imported and the currently active :class:`InteractiveShell` instance is passed
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as the only argument. You can do anything you want with IPython at that point.
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The :func:`load_ipython_extension` will be called again is you load or reload
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the extension again. It is up to the extension author to add code to manage
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that.
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You can put your extension modules anywhere you want, as long as they can be
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imported by Python's standard import mechanism. However, to make it easy to
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write extensions, you can also put your extensions in
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``os.path.join(self.ipython_dir, 'extensions')``. This directory is added to
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``sys.path`` automatically.
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Using extensions
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================
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There are two ways you can tell IPython to use your extension:
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1. Listing it in a configuration file.
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2. Using the ``%load_ext`` magic function.
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To load an extension called :file:`myextension.py` add the following logic
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to your configuration file::
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c.InteractiveShellApp.extensions = [
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'myextension'
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]
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To load that same extension at runtime, use the ``%load_ext`` magic:
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.. sourcecode:: ipython
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In [1]: %load_ext myextension
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To summarize, in conjunction with configuration files and profiles, IPython
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extensions give you complete and flexible control over your IPython
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setup.
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