Python

KeyError: 'xxx'

KeyError

You tried to access a dictionary key that doesn't exist.

Common Causes

Typo in key name
Key not present in data
Wrong data structure assumed

Fixes

1. Use .get() with default
```
value = d.get('key', default)
```
2. Check before access
```
if 'key' in d:
    value = d['key']
```

3. Use try/except

try:
    value = d['key']
except KeyError:
    value = default

Still not fixed?

• Search the exact error message on Stack Overflow or GitHub Issues
• Check the official docs for the language or tool
• Ensure your versions (Node, Python, npm, Docker) are up to date
• Try in a minimal reproduction (new project, single file)

Related Errors

TypeError: 'NoneType' Not Subscriptable ValueError

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All Errors

JavaScript Heap Out of Memory ModuleNotFoundError Address Already in Use IndentationError Cannot Find Module Peer Dependency Warning CORS Policy Blocked TypeError: 'NoneType' Not Subscriptable Merge Conflict Docker Port Already Allocated ENOENT: No Such File or Directory MaxListenersExceededWarning RecursionError Detached HEAD State EACCES: Permission Denied ValueError No Space Left on Device ERR_REQUIRE_ESM FileNotFoundError