Python: Function always returns None

Question

I have some Python code that basically looks like this:

my_start_list = ...

def process ( my_list ):
    #do some stuff

    if len(my_list) > 1:
                


        

Answer 1

As others have pointed out, you are missing a return statement.

I personally would turn that tail recursion into iteration:

def process(my_list):
    while True:
        # do some stuff
        if len(my_list) <= 1:
            return my_list

I think this makes the intent a little clearer, and also avoids some pitfalls associated with tail recursion.