Ubuntu 12.10 Eclipse IDE opens py file with gedit(default) cant run file from gedit? cant switch default to eclipse?

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http://askubuntu.com – I am trying to run a simple 'hello world" py file in Eclipse and the file opens with gedit or gvim and i cant seem to get it to run. So I installed Eclipse and I cant seem to get the py file I select to open in the Eclipse IDE ... Im missing something here for sure should I just uninstall gvim and gedit and just run eclipse? Thanks for your consideration (HowTos)