Identifying the dependency relationship for python packages installed with pip

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When I do a pip freeze I see large number of Python packages that I didn’t explicitly install, e.g.

$ pip freeze
Cheetah==2.4.3
GnuPGInterface==0.3.2
Landscape-Client==11.01
M2Crypto==0.20.1
PAM==0.4.2
PIL==1.1.7
PyYAML==3.09
Twisted-Core==10.2.0
Twisted-Web==10.2.0
(etc.)

Is there a way for me to determine why pip installed these particular dependent packages? In other words, how do I determine the parent package that had these packages as dependencies?

For example, I might want to use Twisted and I don’t want to depend on a package until I know more about not accidentally uninstalling it or upgrading it.

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