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bpo-37051: Refine note on what objects are hashable (GH-13587)

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Raymond Hettinger 2019-05-27 10:21:31 -07:00 committed by GitHub
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Doc/glossary.rst
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@ -512,8 +512,10 @@ Glossary
Hashability makes an object usable as a dictionary key and a set member,
because these data structures use the hash value internally.
All of Python's immutable built-in objects are hashable; mutable
containers (such as lists or dictionaries) are not. Objects which are
Most of Python's immutable built-in objects are hashable; mutable
containers (such as lists or dictionaries) are not; immutable
containers (such as tuples and frozensets) are only hashable if
their elements are hashable. Objects which are
instances of user-defined classes are hashable by default. They all
compare unequal (except with themselves), and their hash value is derived
from their :func:`id`.