python key_error ai_generated true

KeyError: 'key_name'

ID: python/keyerror

Also available as: JSON · Markdown
92%Fix Rate
90%Confidence
320Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
311 active — — —

Root Cause

Dictionary key access fails. Common in config parsing, API responses, and data pipelines.

generic

Workarounds

  1. 95% success Use dict.get(key, default) instead of dict[key] 
    response.get('data', {}).get('items', [])

    Sources: https://docs.python.org/3/library/stdtypes.html#dict.get

  2. 88% success Validate dict structure before access using schema validation 
    from pydantic import BaseModel

class Config(BaseModel):
    host: str
    port: int

config = Config(**raw_dict)  # Validates all required keys upfront

    Sources: https://docs.python.org/3/library/stdtypes.html#dict

Dead Ends

Common approaches that don't work:

  1. Wrap in try/except KeyError 60% fail

    Silences the error but doesn't fix missing data

  2. Add the missing key to the dict manually 55% fail

    Key may be dynamically generated or come from external source

Error Chain

Leads to:
Preceded by: