How to detect which requirement installed a package

Question

I'm looking for installation tree in python, meaning which imported requirement requires a specific package.

Is there an efficient/easy way producing the tree?

Answer 1

pipdeptree

As one of the comments mentioned, pipdeptree is a great tool.

If you are using pyenv, it may not produce accurate results and you may have to run it like this:

pip install pipdeptree

python -m pipdeptree

pip-tools

Another great tool which serves a slightly different purpose is pip-compile which comes with pip-tools.

It allows you to generate a requirements file (for pip install) that contains all the packages and versions while also showing which packages have been pulled in by what.

The resulting requirements.txt file will look like this:

# This file is autogenerated by pip-compile
# To update, run:
#
#    pip-compile --output-file=requirements.txt requirements.in
#
alembic==1.5.5
    # via flask-migrate
click==7.1.2
    # via flask
dnspython==2.1.0
    # via email-validator
dominate==2.6.0
    # via flask-bootstrap
...
...
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