Question

我在Start（）过程中创建了一个变量，但它似乎没有记住过程之外的变量。有没有办法让python记住Start（）过程之外的变量？我的代码如下：

def Start():
    password = raw_input("Enter A Password With 7 Or More Characters: ")
    passwordLength = len(password)
    if passwordLength<7:
        print "Your entered a password with less than 7 characters. Enter a longer password."
        Start()
    else:
        reEnter = raw_input("Re-enter your password: ")
        if reEnter<>password:
        print "Your passwords did not match, please try again."
        Start()
        if reEnter==password:
        print "Your password has been saved."


Start()

print password
print passwordLength

Answer 1

您可以在函数结束时返回变量。

def Start():
    password = input("Enter A Password With 7 Or More Characters: ")
    passwordLength = len(password)
    if passwordLength<7:
        print("Your entered a password with less than 7 characters. Enter a longer password.")
        return Start()
    else:
        reEnter = input("Re-enter your password: ")
        if not reEnter == password:
            print("Your passwords did not match, please try again.")
            return Start()
        else:
            print("Your password has been saved.")
            return password, passwordLength

savedPass, passLength = Start()

print(savedPass)
print(passLength)

编辑：编辑样式（感谢@jrennie）和递归调用。（感谢@bgporter）

Answer 2

我在这里假设密码和密码长度是全局变量。为此，您可以使用global关键字，只需在Start（）的开头定义它们，如下所示：

def Start():
    global password
    global passwordLength

    password = raw_input("Enter A Password With 7 Or More Characters: ")
    passwordLength = len(password)
    if passwordLength<7:
        print "Your entered a password with less than 7 characters. Enter a longer password."
        Start()
    else:
        reEnter = raw_input("Re-enter your password: ")
        if reEnter<>password:
            print "Your passwords did not match, please try again."
            Start()
        if reEnter==password:
            print "Your password has been saved."

然而，全局变量在python中经常被不满。如果可能的话尝试使用return来打印输出，但对于大多数情况来说，全局都很好。

Answer 3

待办事项

def Start():
    global password
    global passwordLength
    ....

改变程序内部的变量

3 个答案: