PYC Version Detector

PYC Version Checker: Core Features and Principles

When migrating projects across different Python environments, PYC file version compatibility can often 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 its header—a 4-byte identifier that records the version of the Python interpreter used to compile the file.

Why Use Our PYC Version Checker?

• Accurately identifies the magic numbers of 190+ Python versions, including mainstream releases from Python 2.7 to 3.12.
• No dependencies required. Pure front-end parsing ensures your privacy and data 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. Complete version information (e.g., "Python 3.9.7 (magic: 0x610d0d0)") will be displayed within 3 seconds.

Frequently Asked Questions (FAQ)

What should I do if the PYC file version detection fails?
First, check the file's integrity. Corrupted PYC files may be missing the magic number in their headers.

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

Important Notes

Only standard .pyc files are supported (not .pyo or .pyw). The maximum file size limit is 10MB. The detection result does not include decompiled bytecode content.

Technical Notes & Best Practices

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.