Getting indices of True values in a boolean list

Question

I have a piece of my code where I\'m supposed to create a switchboard. I want to return a list of all the switches that are on. Here \"on\" will equal True and

Answer 1

Simply do this:

def which_index(self):
    return [
        i for i in range(len(self.states))
        if self.states[i] == True
    ]