On .deb managed systems one can use
$ aptitude why <package>
to find out what installed package required the installation of <package>
for example:
$ aptitude why python
i xdiagnose Depends python (< 2.8)
IMHO $ python -c 'import this'
gives a better answer to the question 'why python', but I digress…
What would be the equivalent on rpm/yum governed systems (in my case Fedora)?
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