python - "if variable not in list"一直不工作返回真

Question

为什么这行代码总是返回true？

def GetPlayersMove(self):
    self.move = input("Enter Rock, Paper or Scissors: ")
    if self.move.lower() not in ["rock" "paper", "scissors"]:
        print("Error")

Answer 1

代码缺少,。

["rock" "paper", "scissors"]
#      ^

"rock""paper" 等价于"rockpaper":

>>> ["rock" "paper", "scissors"]
['rockpaper', 'scissors']
>>>

参见 String literal concatenation