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KeyError

KeyError

What does this code mean?

Code KeyError · An issue reported by Python.

Official explanation · Original text

Raised when a mapping (dictionary) key is not found in the set of existing keys.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Built-in Exceptions — Python 3.15.2 documentation ↗

Creator: Python Software Foundation
License: Python Software Foundation License Version 2
Checked on: 2026-11-12

Modifications: English prose extracted; whitespace normalized; Korean context and classified official links added. Python code examples not redistributed.

Source details · Original licenses and notices