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.

Accepted Answer

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.

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

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