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Is it possible to re-check the dependencies of packages installed with pip? That is, suppose we have a working environment. Then, one of the packages changes (gets upgraded, etc). Is there a command one can run to make to make sure that the dependency tree is still sound and does not have conflicts?
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Pip Check Command – Check Python Dependencies After Installation. Because pip doesn't currently address dependency issues on installation, the pip check command option can be used to verify that dependencies have been installed properly in your project. For example: $ pip check No broken requirements found.
pip is capable of determining and installing the dependencies of packages. The process of determining which version of a dependency to install is known as dependency resolution. This behaviour can be disabled by passing --no-deps to pip install.
Pip will not flag dependency conflicts. As a result, it will happily install multiple versions of a dependency into your project, which will likely result in errors.
Nowadays python -m pip check should do the trick.
Seems to have been added as early as pip 9.0.0 released on 2016-11-02.
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It's not part of pip, but there is a tool you can use called pip-conflict-checker. Just install it through pip and run pipconflictchecker to get a dump of all the conflicts. pipdeptree could also help here.
You might also be interested in reading this article about dealing with pip dependency issues. The article also discusses the two tools I mentioned above along with strategies to fix broken dependencies.
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