重启python程序

Question

我正在尝试在python中重新启动我的程序，但是，由于某种原因，代码在while playagain循环中被捕获。它说＆＃34;这不是一个有效的答案。请输入“是”＆＃39;或者＆＃39; no＆＃39;。＆＃34;当我输入yes，no或任何其他可接受的输入时。为什么要赢得这项工作呢？

while True:
    playagain = input("Would you like to play again?")
    while playagain != "y" or playagain != "Y" or playagain != "Yes" or playagain != "yes" or playagain != "YES" or playagain != "n" or playagain != "N" or playagain != "No" or playagain != "no" or playagain != "NO":
         print("That was not a valid answer. Please enter 'yes' or 'no'.")
         playagain = input("Would you like to play again?")
    if playagain == "y" or playagain == "Y" or playagain == "Yes" or playagain == "yes" or playagain == "YES":
         break
    else:
         print("Thank you for playing MadLibs!")