为什么我的变量返回 None 值？ [关闭]答案

【问题标题】：Why is my variable returning a None value? [closed]为什么我的变量返回 None 值？ [关闭]
【发布时间】：2020-07-02 16:07:39
【问题描述】：

https://pastebin.com/BExAC7rJnew_pass = print(str(encrypt(original_pass)))

我把我的代码放在一个 pastebin 里，因为我很笨，不能用这个网站格式化大块的代码。该代码是一个非常基本的加密器。我需要知道为什么当我尝试打印变量“new_pass”（即加密密码）时，它只会打印为“None”。

#simple password encrypter
def encrypt(phrase):
    encryption = ""
    for letter in phrase:
        if letter in "Aa":
            encryption = encryption + "g"
        elif letter in "Bb":
            encryption = encryption + "r"
        elif letter in "Cc":
            encryption = encryption + "q"
        elif letter in "Dd":
            encryption = encryption + "f"
        elif letter in "Ee":
            encryption = encryption + "z"
        elif letter in "Ff":
            encryption = encryption + "n"
        elif letter in "Gg":
            encryption = encryption + "a"
        elif letter in "Hh":
            encryption = encryption + "v"
        elif letter in "Ii":
            encryption = encryption + "m"
        elif letter in "Jj":
            encryption = encryption + "x"
        elif letter in "Kk":
            encryption = encryption + "s"
        elif letter in "Ll":
            encryption = encryption + "o"
        elif letter in "Mm":
            encryption = encryption + "c"
        elif letter in "Nn":
            encryption = encryption + "u"
        elif letter in "Oo":
            encryption = encryption + "i"
        elif letter in "Pp":
            encryption = encryption + "l"
        elif letter in "Qq":
            encryption = encryption + "w"
        elif letter in "Rr":
            encryption = encryption + "b"
        elif letter in "Ss":
            encryption = encryption + "e"
        elif letter in "Tt":
            encryption = encryption + "p"
        elif letter in "Uu":
            encryption = encryption + "r"
        elif letter in "Vv":
            encryption = encryption + "h"
        elif letter in "Ww":
            encryption = encryption + "y"
        elif letter in "Xx":
            encryption = encryption + "d"
        elif letter in "Yy":
            encryption = encryption + "j"
        elif letter in "Zz":
            encryption = encryption + "g"
        elif letter in "1":
            encryption = encryption + "6"
        elif letter in "2":
            encryption = encryption + "1"
        elif letter in "3":
            encryption = encryption + "5"
        elif letter in "4":
            encryption = encryption + "2"
        elif letter in "5":
            encryption = encryption + "10"
        elif letter in "6":
            encryption = encryption + "7"
        elif letter in "7":
            encryption = encryption + "9"
        elif letter in "8":
            encryption = encryption + "3"
        elif letter in "9":
            encryption = encryption + "8"
        elif letter in "0":
            encryption = encryption + "4"
    return encryption

original_pass = input("Enter raw password: ")
new_pass = print(str(encrypt(original_pass)))

【问题讨论】：

欢迎来到stackoverflow。打印函数返回不返回任何内容。所以 new_pass 将是无。从行中删除打印功能，它应该可以工作。

标签： python python-3.x

【解决方案1】：

你不需要打印变量，使用：

new_pass = str(encrypt(original_pass))

【讨论】：

我更改了它，现在我还可以将加密保存到文件中。 TYSM

【解决方案2】：

你做到了：

new_pass = print(str(encrypt(original_pass)))

这将 print 返回的内容分配给new_pass，而print 总是返回None。制作它：

new_pass = encrypt(original_pass)
print(new_pass)

该函数已经返回一个str，所以我删除了str() 包装。

【讨论】：