# LookupError

- **ID:** `python/lookuperror`
- **Domain:** python
- **Category:** range_error
- **Error Code:** `LookupError`
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Base class for errors raised when a lookup on a mapping or sequence fails.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |