If you don't already use package control.
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For the sublime_text_python_checker
, you have to add the github repo of the project, since its not on the package control repo. To do that do Command-Shift-P to bring up the command window, and go to Package Control: Add Respository
, to add the repo git://github.com/vorushin/sublimetext_python_checker.git
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There are lots of articles on how to get the most out of the editor.