Python

IndentationError: unexpected indent

IndentationError

Python uses indentation for block structure. Mixed tabs/spaces or incorrect alignment causes this error.

Common Causes

Mixing tabs and spaces
Inconsistent indentation levels
Copy-paste from sources with different indentation
Wrong alignment after if/for/def

Fixes

1. Use spaces consistently (PEP 8: 4 spaces)
```
# Configure editor to use 4 spaces, never tabs
```
2. Convert tabs to spaces
```
expand -t 4 file.py > file_fixed.py
```

3. Check block alignment

def foo():
    if True:
        pass  # same indent level for block

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 KeyError

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