How to make PyCharm always show line numbers

Question

I cannot seem to be able to find the setting to enable line numbers for all files, but I have to always right click and enable this on per file basis.

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Answer 1

PyCharm Version 3.4.1(For all files in the project):

File -> Preferences -> Editor (IDE Settings) -> Appearance -> mark 'Show line numbers'

PyCharm Version 3.4.1(only for existing file in the project):

View -> Active Editor -> Show Line Numbers