Weighted_random_select_from_list_by_fieldname.py

def weighted_choice(lst, attr_name):
        total = sum(getattr(item, attr_name, 1) for item in lst)
        r = random.uniform(0, total)
        upto = 0

        for index, item in enumerate(lst):

            if upto + getattr(item, attr_name, 1) >= r:
                return index, item

            upto += getattr(item, attr_name, 1)

        return None, None