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What is a key error in Python?

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From the official python docs: exception KeyError. Raised when a mapping (dictionary) key is not found in the set of existing keys. For example: >>> mydict = {'a':'1','b':'2'} >>> mydict['a'] '1' >>> mydict['c'] Traceback (most recent call last): File "", line 1, in KeyError: 'c' >>> read more

Key Error Keys and Dictionaries in Python. Keys in Python are associated with dictionaries. A dictionary is an unordered set of key-value pairs. read more

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