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bpo-36715: Add usage note for dict.fromkeys() (GH-12974)

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Raymond Hettinger 2019-04-28 00:22:36 -07:00 • committed by GitHub
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Doc/library/stdtypes.rst
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@ -4254,7 +4254,10 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
Create a new dictionary with keys from *iterable* and values set to *value*.
:meth:`fromkeys` is a class method that returns a new dictionary. *value*
defaults to ``None``.
defaults to ``None``. All of the values refer to just a single instance,
so it generally doesn't make sense for *value* to be a mutable object
such as an empty list. To get distinct values, use a :ref:`dict
comprehension <dict>` instead.
.. method:: get(key[, default])