import  random

def one(lenght):
    a = []
    for i in range(length):
        a.append(1)
    return(a)

def two(parent):
    b = parent
    if random.randint(0,10)<11:
        index = random.randint(0,6)
        b[index] = 6
    return

item1 = one(6)
print(item1)
item2 = item1
print(item2)
item3 = two(item1)
print(item2)

[1,1,1,1,1,1]

[1,1,1,1,1,1]

[1,6,1,1,1,1]