This setting might be what you are looking for:
// Set to "none" to turn off drawing white space, "selection" to draw only the
// white space within the selection, and "all" to draw all white space
Copy to your user settings and change it to "all".
I assume you are talking about the triple-quoted text ''' ? These are not scoped as comments, but string.quoted.single.block.python; use Ctrl-Shift-Alt-P to display the current scope in the status bar.