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Identify the Python version of a PYC file using its magic number to resolve compatibility issues.
Drag or click to upload PYC files
PYC
Max 256 KB
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.
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.
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.
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.