How can I see all packages that depend on a certain package with PIP?

Question

I would like to see a list of packages that depend on a certain package with PIP. That is, given django, I would like to see django-cms, django-filer, because I have these packages installed and they all have django as dependency.

Answer 1

Update (2021):

Since pip version 10 you can do:

pkg=httplib2 pip show $pkg | grep ^Required-by 

or for bash

pkg=httplib2 grep ^Required-by <(pip show $pkg) 

so you could create an alias like:

alias pyreq='pip show $pkg | grep ^Required-by' 

and querying by:

pkg=httplib2 pyreq 

which should give (for ubuntu):

Required-by: lazr.restfulclient, launchpadlib 

---

Original:

Quite straightforward:

pip show <insert_package_name_here>| grep ^Requires 

Or the other way around: (sorry i got it wrong!)

for NAME in $(pip freeze | cut -d= -f1); do REQ=$(pip show $NAME| grep Requires); if [[ "$REQ" =~ "$REQUIRES" ]]; then echo $REQ;echo "Package: $NAME"; echo "---" ; fi;  done 

before that set your search-string with:

REQUIRES=django 

essentially you have to go through the whole list and query for every single one. That may take some time.

---

Edit: Also it does only work on installed packages, I don't see pip providing dependencies on not installed packages.

Answer 2

I know there's already an accepted answer here, but really, it seems to me that what you want is to use pipdeptree:

pip install pipdeptree pipdeptree --help  pipdeptree -r -p django