fill_bag

def bag_size(bag):
    sum = 0
    for weight in bag:
        sum += weight
    return sum

def check_bag(bag, input):
    return bag_size(bag) + input < 100

def add_to_bag(bag, input):
    if check_bag(bag, input):
        bag.append(input)
        return True
    else:
        print("The bag would go over 100kg")
        return False

def fill(bag):
    new_weight = int(input("enter a weight: "))
    while(add_to_bag(bag, new_weight)):
        new_weight = int(input("enter a weight: "))
    print("The bag is full with weight {}kg".format(bag_size(bag)))

if __name__ == "__main__":
    bag = []
    fill(bag)