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.

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Conventionally, a Python package's public API symbols (or at least a subset) are exported from the top-level package. These symbols are typically imported from various submodules in the module ...

Human-readable and machine-generated lock file will specify what direct and indirect dependencies should be installed into a Python environment.