ValueError: invalid literal for int()
This error matches known, documented patterns with reliable solutions.
Quick Fix (Most Common Solution)
- Validate string before conversion
- Strip whitespace with .strip()
Seeing "ValueError: invalid literal for int()"? 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
The string you tried to convert to int does not represent a valid integer.
Frequently documented in developer and vendor support forums.
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Common Causes
- String contains non-numeric characters
- Empty string conversion
- Float string to int
How to Fix
- Validate string before conversion
- Strip whitespace with .strip()
- Use float() then int() for decimals
Last reviewed: March 2026 How we review solutions
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Frequently Asked Questions
How do I check if string is numeric?
Use str.isdigit() or try/except around int().
How do I convert float string?
Use int(float("3.14")) to convert decimal strings.
Related Resources
Also Known As
- Python exception
- Python traceback
- Python runtime error
- Python crash
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