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56 lines
1.9 KiB
56 lines
1.9 KiB
Metadata-Version: 2.1
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Name: backcall
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Version: 0.2.0
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Summary: Specifications for callback functions passed in to an API
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Home-page: https://github.com/takluyver/backcall
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License: UNKNOWN
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Author: Thomas Kluyver
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Author-email: thomas@kluyver.me.uk
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Description-Content-Type: text/x-rst
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Classifier: License :: OSI Approved :: BSD License
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Classifier: Programming Language :: Python :: 2
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Classifier: Programming Language :: Python :: 2.7
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Classifier: Programming Language :: Python :: 3
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========
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backcall
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========
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.. image:: https://travis-ci.org/takluyver/backcall.png?branch=master
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:target: https://travis-ci.org/takluyver/backcall
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Specifications for callback functions passed in to an API
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If your code lets other people supply callback functions, it's important to
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specify the function signature you expect, and check that functions support that.
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Adding extra parameters later would break other peoples code unless you're careful.
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backcall provides a way of specifying the callback signature using a prototype
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function::
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from backcall import callback_prototype
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@callback_prototype
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def handle_ping(sender, delay=None):
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# Specify positional parameters without a default, and keyword
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# parameters with a default.
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pass
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def register_ping_handler(callback):
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# This checks and adapts the function passed in:
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callback = handle_ping.adapt(callback)
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ping_callbacks.append(callback)
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If the callback takes fewer parameters than your prototype, *backcall* will wrap
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it in a function that discards the extra arguments. If the callback expects
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more arguments, a TypeError is thrown when it is registered.
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For more details, see the `docs <http://backcall.readthedocs.org/en/latest/>`_ or
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the `Demo notebook <http://nbviewer.ipython.org/github/takluyver/backcall/blob/master/Demo.ipynb>`_.
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The tests are run with `pytest <http://pytest.org/latest/>`_. In the root directory,
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execute::
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py.test
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