AI engineering glossary · Python core
What is indexError?
IndexError: A built-in exception raised when a sequence index is outside the valid range of positions. It commonly appears in loops that run one step too far, or when code assumes a list has more items than it actually holds.
IndexError: an example
nums = [1, 2, 3]; nums[3] raises IndexError: list index out of range, since valid indexes are 0 to 2.