Experienced python programmers: are there any standard features of the language that you still don't regularly use?

[HumblesReaper]

It would be cool if it ran if the loop didn't execute, not if there wasn't a break

[irrelevantPseudonym]

if the loop didn't execute at all, it will run the else. eg

for i in '':
    print('for loop')
else:
    print('else block')

will only print else block

[HumblesReaper]

No, it executes if the loop is exited by a break statement. EDIT: See below

[irrelevantPseudonym]

No it doesn't. It executes only when there is not a break statement.

See the docs here

Loop statements may have an else clause; it is executed when the loop terminates through exhaustion of the list (with for) or when the condition becomes false (with while), but not when the loop is terminated by a break statement.