List of Python Script File-Extensions

Python scripts may have one of several file extensions. Each file extension has a special meaning and purpose.

• *.py - Regular scripts
• *.py3 - (rarely used) Python3 script; Python3 scripts usually end with "*.py" not "*.py3"
• *.pyc - compiled script (Bytecode)
• *.pyo - optimized pyc bytecode file (As of Python3.5, Python will only use pyc rather than pyo and pyc)
• *.pyw - Python script for Windows that is executed with pythonw.exe
• *.pyx - Cython src to be converted to C/C++
• *.pyd - Python script made as a Windows DLL
• *.pxd - Cython script which is equivalent to a C/C++ header
• *.pyi - MyPy stub
• *.pyi - Stub file (PEP 484)
• *.pyz - Python script archive (PEP 441); this is a script containing compressed Python scripts (ZIP) in binary form after the standard Python script header
• *.pywz - Python script archive for MS-Windows (PEP 441); this is a script containing compressed Python scripts (ZIP) in binary form after the standard Python script header
• *.py[cod] - wildcard notation in ".gitignore" that means the file may be "*.pyc", "*.pyo", or "*.pyd"
• *.rpy - RPython script or a Python script containing application or framework-specific features
• *.pyde - Python script used by Processing (https://processing.org/)
• *.pyp - Py4D Python Plugin
• *.pyt - Python declaration file
• *.xpy - Unknown
• *.ipynb - Jupyter Notebook file