Sublime Text --- Visible white-space(indentation) characters

 People use Geany knows that user can configure "show white space" to display the indentation spaces, it is really helpful for developers to view source codes like python.

It looks like this:

This feature  can be configured in Sublime Text as well. Choose Preference, then Settings-Default and past the below json configuration:

{
"font_size": 10,
"draw_white_space": "all"
}

Reference: link here
Then the source code in Sublime will look like this: