The newly approved Python Enhancement Proposal 751 gives Python a standard lock file format for specifying the dependencies of projects. Here’s the what, why, and when.

Human-readable and machine-generated lock file will specify what direct and indirect dependencies should be installed into a Python environment. Topics Spotlight: New Thinking about Cloud Computing ...

When Python for Windows is installed, it will associate the .pyzw file extension with the Python executable, causing Python to execute the scripts automatically when the file is double-clicked.