bool value of a list in Python

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 i

Answer 1

If len(my_list) == 0 it is returned as false, otherwise it is true. It is completely pythonic to write:

return len(my_list)

which although it is returned as an integer, evaluates as true for non zero lengths, and false otherwise.