python中未定义的变量 [英] variable not defined in python

问题描述

我是python编程的新手.我正在启动我的第一个程序，但遇到了一些麻烦..是否有更好的方法来执行下面的代码片段?当我运行程序时，我得到"yes_no"未定义.

Hi I'm very new with programming in python. I'm starting my first program but i'm having a little trouble.. is there a better way of doing the snippet of code below? When i run the program I get "yes_no" not defined.

def main():
    print "\n Welcome to registration. Are you an authorized user?\n"
    yes_no = raw_input("Yes or No?: ")
    if yes_no in ("Yes", "yes"):
        return oldUser()
    elif yes_no in ("y", "Y"):
        print ("Please enter YES")
        return wrong()
    elif yes_no in ("n", "N"):
        return wrong()
    else:
        print ("\n Unauthorized text!\n")
        return main()

def wrong():
    if yes_no in ("y", "Y"):
        print ("Please Enter Yes!")
        return main()
    else:
        yes_no in ("n", "N")
        print ("Please Enter No!")
        return main()

推荐答案

yes_no未在errors()方法中定义，因此仅在main()中可见.您可以像错误(yes_no)一样将yes_not传递到错误()中

yes_no is not defined in wrong() method, so it is only visible in main(). You can pass yes_not into wrong() like wrong(yes_no)

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