Get all modules/packages used by a python project

by

You can give a try to the library
https://github.com/bndr/pipreqs
found following the guide
https://www.fullstackpython.com/application-dependencies.html

The library pipreqs is pip installable and automatically generates the file requirements.txt.

It contains all the imports libraries with versions you are using in the virtualenv or in the python correctly installed.
Just type:

pip install pipreqs
pipreqs /home/project/location

It will print:

INFO: Successfully saved requirements file in /home/project/location/requirements.txt

In addition it is compatible with the pip install -r command: if you need to create a venv of your project, or update your current python version with compatible libraries, you just need to type:

pip install -r requirements.txt

I had the same problem and this library solved it for me. Not sure if it works for multiple layers of dependencies i.e. in case you have nested level of dependent libraries.

— Edit 1:

If looking for a more sophisticated version manager, please consider as well pyvenv https://github.com/pyenv/pyenv. It wraps virtualenv producing some improvements over the version specification that is created by pipreqs.

— Edit 2:

If, after creating the file with the dependency libraries of your module with pipreqs, you want to pin the whole dependency tree, take a look at pip-compile. It figures out a way to get the dependencies of your top level libraries, and it pins them in a new requirement files, indicating the dependency tree.

— Edit 2:

If you want to split your dependency tree into different files (e.g. base, test, dev, docs) and have a way of managing the dependency tree, please take a look at pip-compile-multi.

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