Promises

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.. image:: http://pypip.in/v/Promises/badge.png :target: https://pypy.python.org/pypi/Promises

.. image:: https://pypip.in/d/Promises/badge.png :target: https://pypi.python.org/pypi/Promises/

Promises is a simple Python library for the runtime enforcement of types during function calls. It has the unfortunate fate of being the same name as the Javascript pattern. Usage examples:

.. code-block:: python

@accepts(AnyOf[int,float])
@returns(str)
def f(x):
    return str(x)

Note the getitem magic implemented in the AnyOf pseudo-type. These pseudo-types can be combined like logical operators to create long, hard-to-grok type signatures. The current iteration of Promises hopes to streamline the library from it's previous cluttered state.