NameError: name is not defined
This error matches known, documented patterns with reliable solutions.
Quick Fix (Most Common Solution)
- Define variable before using
- Check spelling of name
Seeing "NameError: name is not defined"? This error can be frustrating, but it's usually fixable. It typically affects your development workflow or system. Below you'll find clear, step-by-step solutions to resolve this issue.
What This Error Means
You referenced a name that Python does not recognize.
Frequently documented in developer and vendor support forums.
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Common Causes
- Variable not defined yet
- Typo in variable name
- Wrong scope
How to Fix
- Define variable before using
- Check spelling of name
- Check variable scope
Last reviewed: March 2026 How we review solutions
Optional follow-up
Some users ask whether saving fixes for recurring errors would be useful when the same issue appears again.
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Frequently Asked Questions
Why is my import not working?
Check if import statement executed successfully.
What about global variables?
Use global keyword inside functions to access them.
Related Resources
Also Known As
- Python exception
- Python traceback
- Python runtime error
- Python crash
Common Search Variations
- "python error fix"
- "python script not working"
- "python traceback what does it mean"
- "how to fix python exception"
- "python crash on startup"
- "python import error solution"
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