python - show reverse dependencies with pip?

Question

Is it possible to show the reverse dependencies with pip?

I want to know which package needs package foo. And which version of foo is needed by this package.

Answer 1

I found Alexander's answer perfect, except it's hard to copy/paste. Here is the same, ready to paste:

import pip
def rdeps(package_name):
    return [pkg.project_name
            for pkg in pip.get_installed_distributions()
            if package_name in [requirement.project_name
                                for requirement in pkg.requires()]]

rdeps('some-package-name')