fun with mappings

[Joshua Bronson]

Know thine equalities

>>> d = {1: int, 1.0: float, True: bool}
>>> d[1.0]
<class 'bool'>
>>> 1+0j in d
True

especially when intransitive

>>> from collections import OrderedDict
>>> d = dict([(0, 1), (2, 3)])
>>> od = OrderedDict([(0, 1), (2, 3)])
>>> od2 = OrderedDict([(2, 3), (0, 1)])
>>> d == od
True
>>> d == od2
True
>>> od == od2
False
>>> class MyDict(dict):
...   __hash__ = lambda self: 0
...
>>> class MyOrderedDict(OrderedDict):
...   __hash__ = lambda self: 0
...
>>> d = MyDict([(0, 1), (2, 3)])
>>> od = MyOrderedDict([(0, 1), (2, 3)])
>>> od2 = MyOrderedDict([(2, 3), (0, 1)])
>>> len({d, od, od2})
1
>>> len({od, od2, d})
2

❤️ ❤️ ❤️