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Last active September 15, 2023 15:53
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Pip dependency hell.md

Dependency management in python

Python is not able to handle 2 different versions from the same package.

Dependency handling issue

When Pip <20.3 finds an unresolvable dependency (resolves a dependecy to 2+ versions) then would not halt the installation process. It’d successfully continue the process by installing the first matching dependency in the list of conflicts.

...
ERROR: pip's dependency resolver does not consider dependency conflicts when
selecting packages. This behaviour is the source of the following dependency
conflicts.
flask 2.2.1 requires click>=8.0, but you'll have click 7.1.2 which is
incompatible.
...

More details can be found here.

This is basically a silent killer because some of the libraries are not going to work runtime but one must watch the log to catch error (instead of pip would stop).

Dependency handling solution

Upgrade to >=20.3 which contains a more strict dependency resolution algorithm + stops the installation.

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