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: June 2026 How we review solutions
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OS-Specific Behavior
Valueerror Int Conversion on Windows: Path, Shell, and Script Differences
Valueerror Int Conversion on Windows because of path separator differences, case sensitivity, shell availability, and how Windows handles scripts.
The most impactful differences: Windows uses backslash (\) as the path separator — use pathlib.Path or os.path.join() rather than string concatenation. Windows is case-insensitive for paths, so import MyModule and import mymodule both work on Windows but only one works on Linux. os.system() or subprocess commands that call bash, grep, sed, or awk fail on Windows unless run inside WSL2 or Git Bash. Python scripts without a shebang line need python script.py explicitly — not ./script.py. For PowerShell users, the activation script for venv is .venv\Scripts\Activate.ps1, but PowerShell's execution policy may block it — run Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser once to allow signed local scripts.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
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
Common Search Variations
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- "python import error solution"
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