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bpo-41621: Document defaultdict's default_factory parameter (GH-21945) 

It defaults to None and is positional only.
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Dennis Sweeney 2021-06-22 10:19:24 -04:00 committed by GitHub
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4
Doc/library/collections.rst
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@ -707,9 +707,9 @@ stack manipulations such as ``dup``, ``drop``, ``swap``, ``over``, ``pick``,
:class:`defaultdict` objects
----------------------------
.. class:: defaultdict([default_factory[, ...]])
.. class:: defaultdict(default_factory=None, /, [...])
Returns a new dictionary-like object. :class:`defaultdict` is a subclass of the
Return a new dictionary-like object. :class:`defaultdict` is a subclass of the
built-in :class:`dict` class. It overrides one method and adds one writable
instance variable. The remaining functionality is the same as for the
:class:`dict` class and is not documented here.

1
Misc/NEWS.d/next/Documentation/2020-08-24-13-35-04.bpo-41621.nqaw9G.rst Normal file
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@ -0,0 +1 @@
Document that :class:`collections.defaultdict` parameter ``default_factory`` defaults to None and is positional-only.

2
Modules/_collectionsmodule.c
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@ -2241,7 +2241,7 @@ defdict_init(PyObject *self, PyObject *args, PyObject *kwds)
}
PyDoc_STRVAR(defdict_doc,
"defaultdict(default_factory[, ...]) --> dict with default factory\n\
"defaultdict(default_factory=None, /, [...]) --> dict with default factory\n\
\n\
The default factory is called without arguments to produce\n\
a new value when a key is not present, in __getitem__ only.\n\