菜鸟数组问题 ，为什么还是有重复值

程序部分：
  import random

bl= []
rl= []


while  len(bl) < 6:
    blueR = random.randint(1,35)
    print("#####  ########",bl,"%%%%%%%%%%%%",blueR)
    blueR not in bl
    bl.append(blueR)
    print(bl)
while len(rl)<3:
        readR = random.randint(1,12)
        readR not in rl
        rl.append(readR)
        print(rl)
print (bl)
print (rl)
执行结果：
#####  ######## [] %%%%%%%%%%%% 2
[2]
#####  ######## [2] %%%%%%%%%%%% 15
[2, 15]
#####  ######## [2, 15] %%%%%%%%%%%% 2
[2, 15, 2]
#####  ######## [2, 15, 2] %%%%%%%%%%%% 5
[2, 15, 2, 5]
#####  ######## [2, 15, 2, 5] %%%%%%%%%%%% 10
[2, 15, 2, 5, 10]
#####  ######## [2, 15, 2, 5, 10] %%%%%%%%%%%% 35
[2, 15, 2, 5, 10, 35]
[2]
[2, 3]
[2, 3, 11]
[2, 15, 2, 5, 10, 35]
[2, 3, 11]
为什么重复值还是进了数组，麻烦解答？

忘写if了！

import random

bl= []
rl= []


while  len(bl) < 6:
    blueR = random.randint(1,35)
    print("#####  ########",bl,"%%%%%%%%%%%%",blueR)
    if blueR not in bl:
            bl.append(blueR)
            print(bl)
while len(rl)<3:
    readR = random.randint(1,12)
    if readR not in rl:
        rl.append(readR)
        print(rl)
print (bl)
print (rl)

我加上了if 没有看到重复啊
#####  ######## [] %%%%%%%%%%%% 7
[7]
#####  ######## [7] %%%%%%%%%%%% 35
[7, 35]
#####  ######## [7, 35] %%%%%%%%%%%% 16
[7, 35, 16]
#####  ######## [7, 35, 16] %%%%%%%%%%%% 21
[7, 35, 16, 21]
#####  ######## [7, 35, 16, 21] %%%%%%%%%%%% 3
[7, 35, 16, 21, 3]
#####  ######## [7, 35, 16, 21, 3] %%%%%%%%%%%% 17
[7, 35, 16, 21, 3, 17]
[5]
[5, 11]
[5, 11, 8]
[7, 35, 16, 21, 3, 17]
[5, 11, 8]