How to make PyCharm always show line numbers

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.

There must be a global setting for this, right?

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

For version 4.0, 4.5 on Windows

File -> Settings

Then,

Editor -> General -> Appearance -> Show line numbers

For version 4.0 on Mac OSX

PyCharm-->Preferences

Then,

Editor-->General-->Appearance-->checkbox: "Show line numbers"

For version 3.0 (Community Edition):

File -> Settings -> Editor (under IDE Settings) -> Appearance -> check 'Show line numbers'

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

For version 2.6 and up, the dialog is in the "Preferences" dialog, access using Cmd ',':

PyCharm (far left menu) -> Preferences... -> Editor (bottom left section) -> Appearance -> Show line numbers checkbox

v. community 5.0.4 (linux): File -> Settings -> Editor -> General -> Appearance -> now check 'Show line numbers', confirm w. OK an voila :)

Using Search bar

1. Press 2 times Shift
2. Paste /editor /appearance/ and then
3. Click on Show line numbers toggle button

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For Windows and Linux

> File | Settings | Editor | General | Appearance

For macOS

> IntelliJ IDEA | Preferences | Editor | General | Appearance

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Using shortcut

> Ctrl+Alt+S

Then

Editor > General > Appearance

Click on Show line numbers toggle button.

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Pycharm Official Doc (Appearance)