Python KeyError Exceptions and How to Handle Them
Python KeyError Exceptions and How to Handle Them Free Tutorial Download
Python’s KeyError exception is a common exception encountered by beginners. Knowing why a KeyError can be raised and some solutions to prevent it from stopping your program are essential steps to improving as a Python programmer.
By the end of this tutorial, you’ll know:
- What a Python
KeyErrorusually means - Where else you might see a
KeyErrorin the standard library - How to handle a
KeyErrorwhen you see it
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What a Python KeyError Usually Means#
A Python KeyError exception is what is raised when you try to access a key that isn’t in a dictionary (dict).
Python’s official documentation says that the KeyError is raised when a mapping key is accessed and isn’t found in the mapping. A mapping is a data structure that maps one set of values to another. The most common mapping in Python is the dictionary.
The Python KeyError is a type of LookupError exception and denotes that there was an issue retrieving the key you were looking for. When you see a KeyError, the semantic meaning is that the key being looked for could not be found.
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