defaultdict
- defaultdict(default_factory=None, /, **kwargs)
- defaultdict(default_factory, mapping, /, **kwargs)
- defaultdict(default_factory, iterable, /, **kwargs)
defaultdict(default_factory=None, /, [...]) --> dict with default factory The default factory is called without arguments to produce a new value when a key is not present, in __getitem__ only. A defaultdict compares equal to a dict with the same items. All remaining arguments are treated the same as if they were passed to the dict constructor, including keyword arguments.
© Python Software Foundation. PSF License Version 2 · Official docs ↗
Changed in 3.9
- 3.9: Added merge (|) and update (|=) operators, specified in PEP 584.
Members of defaultdict
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- __missing__
- __missing__(key) # Called by __getitem__ for missing key; pseudo-code: if self.default_factory is None: raise KeyError((key,)) self[key] = value = self.default_factory() return value
d
- default_factory
- Factory for default value called by __missing__().
