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With Python dictionaries, you have at least four available ways to handle missing keys:
- Use .setdefault()
- Use .get()
- Use the key in dict idiom
- Use a try and except block
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Using the Python defaultdict Type for Handling Missing Keys
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WEBDec 13, 2021 · The object overrides the default dictionary behavior of throwing a KeyError when you try to access a key that doesn’t exist. You’ll get a complete overview of the defaultdict and how it’s different from …
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Code sample
def __missing__(self, key):if self.default_factory is None:raise KeyError((key,))self[key] = value = self.default_factory(key)return value...python - Suppress key addition in collections.defaultdict - Stack …