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bijection
=========
Bijections are functions that map keys to unique values, ie.
one-to-one, onto functions. See: https://en.wikipedia.org/wiki/Bijection
`bijection` maintains the inverse mapping on `bijection.inverse` which
is itself an instance of `bijection`.
Examples
--------
.. code-block:: python
>>> from collections_extended import bijection
>>> bij = bijection({'a': 1, 'b': 2, 'c': 3})
>>> bij.inverse[2]
'b'
>>> bij['a'] = 2
>>> bij == bijection({'a': 2, 'c': 3})
True
>>> bij.inverse[1] = 'a'
>>> bij == bijection({'a': 1, 'c': 3})
True
>>> bij.inverse.inverse is bij
True
API
---
.. autoclass:: collections_extended.bijection
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