如何修复Python中的无限循环？

我正在用Python编写一个登录安全程序，这部分总是卡在无限循环中。如果你被锁在外面，它会不断地说“你被锁在外面10秒钟了”，然后无限循环。我该如何解决这个问题

tries=0
while finalusername!=username or  finalpassword!=password:
tries=tries+1
print "That incorrect. Try again."
print "You have", 5-tries, "tries left."
finalusername= raw_input ("Username:")
finalpassword= raw_input ("Password:") 
while tries>=4:
    print "You have been locked out for 10 seconds. Please call the administrator if this keeps happening."
    sleep (10.0)
    system ('CLS')
    finalusername!=username
    finalpassword!=password

容易，改变

  while tries>=4:

到

如果你遵循你的代码，当你进入你的第二个while循环时，变量trys的值永远不会改变，所以你将永远留在那里。如果将while更改为If，则将执行If语句的主体，然后继续循环。

当尝试次数大于四次时，第二个while循环将激活，但循环本身从不在尝试时运行或包含任何其他退出条件。这就是它变得无限的原因。因此，尝试保持在4以上，循环从未停止

根据你的代码，在我看来，在他们尝试完之后，他们会被锁定10秒钟，然后重新开始？如果是这样，您希望如下调整代码：

tries=0
while finalusername!=username or  finalpassword!=password:
    tries=tries+1
    print "That incorrect. Try again."
    print "You have", 5-tries, "tries left."
    finalusername= raw_input ("Username:")
    finalpassword= raw_input ("Password:") 
    if tries>=4:
        print "You have been locked out for 10 seconds. Please call the administrator if this keeps happening."
        sleep (10.0)
        system ('CLS')
        tries = 0 #Reset tries counter
        finalusername!=username #I don't think this part is required
        finalpassword!=password #I don't think this part is required

---

我认为您应该在睡眠后将尝试设置为0，如果没有必要，则循环。睡眠后，用户应再次尝试5次

import os
import time

tries=0
finalusername, finalpassword= 'a', 'a'
username, password = None, None


while True:
    finalusername= raw_input ("Username:")
    finalpassword= raw_input ("Password:") 
    if finalpassword == username and finalpassword == password:
        break
    tries=tries+1
    print "That incorrect. Try again."
    print "You have", 5-tries, "tries left."
    if tries>=5:
        print "You have been locked out for 10 seconds. Please call the administrator if this keeps happening."
        time.sleep (10.0)
        os.system('cls')
        tries = 0

---

你的压痕显然是错的。这将生成语法错误。

import os
import time

tries=0
finalusername, finalpassword= 'a', 'a'
username, password = None, None


while True:
    finalusername= raw_input ("Username:")
    finalpassword= raw_input ("Password:") 
    if finalpassword == username and finalpassword == password:
        break
    tries=tries+1
    print "That incorrect. Try again."
    print "You have", 5-tries, "tries left."
    if tries>=5:
        print "You have been locked out for 10 seconds. Please call the administrator if this keeps happening."
        time.sleep (10.0)
        os.system('cls')
        tries = 0