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

Version 2.6 and above:
PyCharm (far left menu) -> Preferences... -> Editor (bottom left section) -> General -> Appearance -> Show line numbers checkbox

Version 2.5 and below:
Settings -> Editor -> General -> Appearance -> Show line numbers checkbox