Question

what is the best way to turn a list into bool value? I am looking for something like:

return eval_bool(my_list)

I have a custom container in which I implement the __nonzero__ method which is supposed to work like this:

if self.my_list:
    return True
return False

But is it pythonic enough? 🙂 Anyway, I am curious how Python interprets the value of the list in the if statement because this code works differently:

return my_list == True

J.

Answer 1

Just use:

bool(my_list)

Which evaluates it as Python “truthiness” and returns a real Boolean.