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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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up vote 4 down vote accepted
$ rpm -q --whatrequires python
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