Give an optional parameter a default value that depends on another parameter in Python

Question

My question is rather simple : is there a more pythonic way of doing this?

def f(array, start=0, end=None):
    if not end:
        end = len(array)
    (...)

Because using f(array, start=0, end=len(array) won't work.

Answer 1

Not really. One nitpick:

def f(array, start=0, end=None):
    if end is None:
        end = len(array)