PYC files contain compiled Python code to enhance execution speed. The Python compiler converts .py source files into .pyc bytecode files. Programs supporting .pyc files can be found on any operating system. There are 3 categories of software programs that open .pyc files based on the system platform.
.pyo files were used before Python 3.5. They contain .pyc bytecode created with optimizations. .pyd files are basically Windows dll files providing additional functionality. Understanding .pyc, .pyd and .pyo file extensions helps optimize Python code.
The .pyc format speeds up importing modules again by saving compiled bytecode. There are 140 file types with .pyc extension but most are not compatible. The format was developed by unknown. Files were likely generated by the Jabbim program.
