Articles/Python

AssertionError in Python — What It Means and How to Fix It

What Python's AssertionError exception means and how to resolve it.

Published October 28, 2026

AssertionError is raised when an assert statement's condition evaluates to False.

Key points

  • Catch it specifically with "except AssertionError:" when you want to handle this exact case rather than a bare except

Example

assert 1 == 2, 'values differ'  # AssertionError: values differ
More Python articles