keyerror:
In languages such as Python and Ruby, a KeyError is a specific exception type that is raised when a key could not be found within a dictionary (mapping). In Python, it is a subclass of LookupError. In Ruby, it is a subclass of IndexError.
In languages such as Python and Ruby, a KeyError is a specific exception type that is raised when a key could not be found within a dictionary (mapping). In Python, it is a subclass of LookupError. In Ruby, it is a subclass of IndexError.
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