Web Reference: Understand why Python raises a KeyError for bad key lookups in a dictionary. Fix your KeyError now and learn to handle them for smooth scripting. Jul 23, 2025 · In this article, we will explore what a KeyError is, why it occurs, and various methods to fix it. A 'KeyError' occurs when you try to access a key in a dictionary that doesn't exist. In Python, dictionaries are composed of key-value pairs, and keys are used to access the corresponding values. The KeyError exception occurs when you use a key on a dictionary, and the key does not exist. You can handle the KeyError in a try...except statement, see the example below.
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