Pythonic way to determine whether not null list entries are 'continuous'

Question

I\'m looking for a way to easily determine if all not None items in a list occur in a single continuous slice. I\'ll use integers as examples of not None items

Answer 1

You could use something like itertools.groupby:

from itertools import groupby

def are_continuous(items):
    saw_group = False

    for group, values in groupby(items, lambda i: i is not None):
        if group:
            if saw_group:
                return False
            else:
                saw_group = True

    return True

This will iterate only until it sees a group twice. I'm not sure if you consider [None, None], so tweak it to your needs.