PYC Version Checker

PYC Version Checker: Core Features & Principles

When migrating projects across different Python environments, .pyc file version compatibility can be a headache. This tool quickly and accurately identifies the Python version of a .pyc file (e.g., Python 3.8.5) by parsing the magic number in the file header—a 4-byte identifier that records the version of the Python interpreter used to compile it.

Why Choose Our PYC Version Checker?

• Accurately identifies magic numbers for 190+ Python versions, including mainstream releases from Python 2.7 to 3.12.
• No dependencies required; pure front-end parsing ensures your privacy and security.
• Supports corrupted file detection, automatically prompting you about potential structural issues.

How to Use

1. Click the upload button or drag and drop your .pyc file into the designated area.
2. The system will automatically parse the magic number in the file header.
3. View the complete version information within 3 seconds (e.g., "Python 3.9.7 (magic: 0x610d0d0)").

Frequently Asked Questions (FAQ)

What should I do if the PYC version detection fails?
First, check the file's integrity. A corrupted .pyc file may be missing the magic number in its header.

Is the mapping between magic numbers and Python versions fixed? Every minor Python release (e.g., 3.8.1 to 3.8.2) changes the magic number, while major releases (e.g., 3.7 to 3.8) completely reset the encoding rules.

Important Notes

This tool only supports standard .pyc files (not .pyo or .pyw). The maximum file size is 10MB. The detection result does not include decompiled bytecode content.

Technical Notes & Tips

Typical magic number examples: Python 3.9.7 → 0x610d0d0, Python 2.7.18 → 0x03f30d0a. When executing .pyc files across different versions, we recommend using this tool first to verify magic number compatibility.