answer = input("\nDo you want to see the instruction? (y/n): ")
while answer != ("y","n"):
answer = input("\nThat answer is not valid. Try again: ")
if answer == "y":
print("Instructions.")
break`
if answer == "n":
break
问题是这样的：
Do you want to see the instruction? (y/n): n
That answer is not valid. Try again: n
Do you want to play easy or hard version? (e/h):
我不知道为什么它只接受第二次而不是第一次接受。
您answer对照元组进行检查("y","n")。您应该只检查自己answer是否是元组的元素之一：
while answer not in ("y", "n"):
另外，您还需要将指令的打印移到循环外：
answer = input("\nDo you want to see the instruction? (y/n): ")
while answer not in ("y", "n"):
answer = input("\nThat answer is not valid. Try again: ")
if answer == "y":
print("Instructions.")
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