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      Python apps will often use packages and modules that don’t come as part of the standard library.

This means it may not be possible for one Python installation to meet the requirements of every app. If app A needs version 1.0 of a particular module but app B needs version 2.0, then the requirements are in conflict and installing either version 1.0 or 2.0 will leave one application unable to run.

The solution is to create a virtual environment, a self-contained directory tree that contains a Python installation.