如何从else语句中重新启动我的代码？

Question

这里有一些我一直在编写的代码（python3.4），我不知道如何在else语句之后重新启动程序。我知道没有goto语句

我尝试过把if语句放在while true循环中，但它只是循环print行，反复打印输出

import random
    import string

    PassGen = ""

    length = int(input("how many characters would you like your password to have 8-15? "))

    if 8 <= length <=15:
        while len(PassGen) != length:
            Num1 = random.choice(string.ascii_uppercase)
            Num2 = random.choice(string.ascii_lowercase)
            Num3 = random.choice(string.digits)
            everything = [Num1, Num2, Num3]
            PassGen += random.choice(everything)
        print (PassGen)
    else:
        print ("that is an incorrect value")

目前，它可以很好地工作，从用户那里获取输入，然后查看输入是否在8-15之间。如果是这样的话，它将生成一个带有内部while循环的密码。否则，它将打印不正确的值

Answer 1

你很接近while True很好，但您还需要一个break来摆脱它：

while True:
    length = int(input("how many characters would you like in your password"))
    if 8 <= length <=15:
        while len(PassGen) != length:
            Num1 = random.choice(string.ascii_uppercase)
            Num2 = random.choice(string.ascii_lowercase)
            Num3 = random.choice(string.digits)
            everything = [Num1, Num2, Num3]
            PassGen += random.choice(everything)
        print (PassGen)
        break
    else:
        print ("that is an incorrect value")