Python:如何让程序在用户输入时提示用户一定的固定次数？

Question

在程序中，用户必须输入密码，如果输入错误，程序将再提示他两次，如果两次错误，程序将过期。我该怎么做呢？这是我到目前为止的程序...

password=input("Enter password:")
while password != 'cat': 
    print ("password is wrong, try it again")
    password= input ("Enter your password:")

print ("Password correct be happy")

Answer 1

慈善程序员

for trial in range(3):
    print ("Attempt no.",trial, end=" ")
    passw = input('.  Enter password > ')
    if passw == 'cat' : break
else:
    passw = 'cat'

是的，简单的 for 循环也有一个 else 子句:"Loop statements may have an else clause; it is executed when the loop terminates through exhaustion of the list (with for) or when the condition becomes false (with while), but not when the loop is terminated by a break statement." .