Python 2 to 3
Convert Python 2 code to Python 3 using 2to3-style runtime fixers.
About Python 2 to 3
Python 2 to 3 Converter helps migrate legacy Python 2 projects to modern Python 3 syntax with real conversion fixers and compatibility rewrites. The tool can update print statements, exception syntax, iterators, and common built-ins to reduce manual migration effort. It is designed for developers maintaining old applications who need faster modernization, cleaner code review diffs, and safer upgrade planning. After conversion, run tests and lint checks to validate string, bytes, and dependency behavior on your target Python 3 version.
Frequently Asked Questions
Everything you need to know about this tool.
The runtime path uses fissix (a maintained lib2to3-style fixer set) and falls back to local heuristics only when runtime is unavailable.
Yes. Common syntax updates such as print() and xrange to range are handled by conversion fixers.
No. Automated conversion handles syntax patterns, but business logic and library compatibility still require review.
Not always. Unicode, bytes, and encoding logic should be tested carefully after migration.
No. Dependencies must support your Python 3 target version and may need package upgrades.
Use this tool for file-level conversion and run project-wide CI validation to catch integration issues.
Yes. Run unit, integration, and smoke tests before deploying converted code.
Yes, as a migration accelerator. Pair it with code review, static analysis, and staged rollout checks.