python - 密码必须至少包含一个大写或小写字母和一个数字

Question

作为学校工作，我正在尝试制作密码加密/解密程序。我需要考虑以下规则：

1. 确保每个密码至少包含一个字母 (AZ) 或 (az)、一个非字母字符（来自 #、@、%）和至少一个数字。程序必须拒绝违反此规则的密码。
2. 将密码中允许的字符限制为字母 (AZ) 和 (az)、数字 (0-9) 和三个字符（#、@、%）。程序必须拒绝违反此规则的密码。

如果密码违反这些条件，我将终止程序：

print('Invalid password!')
sys.exit()

我已经被困了几个小时试图添加这些条件......我不知道在哪里添加这些条件，无论我在哪里添加它们，即使我输入了有效的密码，我的程序也会终止TT

这是我到目前为止所拥有的（我已经删除了解密部分，以便我之后可以尝试为自己找出该部分）：

# import sys module for termination
import sys

# init
password_out = ''
case_changer = ord('a') - ord('A')
encryption_key = (('a','m'), ('b','h'), ('c','t'), ('d','f'), ('e','g'),
  ('f','k'), ('g','b'), ('h','p'), ('i','j'), ('j','w'), ('k','e'),('l','r'),
  ('m','q'), ('n','s'), ('o','l'), ('p','n'), ('q','i'), ('r','u'), ('s','o'),
  ('t','x'), ('u','z'), ('v','y'), ('w','v'), ('x','d'), ('y','c'), ('z','a'),
  ('#', '!'), ('@', '('), ('%', ')'), ('0'), ('1'), ('2'), ('3'), ('4'), ('5'),
  ('6'), ('7'), ('8'), ('9'))

encrypting = True

# get password
password_in = input('Enter password: ')

# perform encryption / decryption
if encrypting:
    from_index = 0
    to_index = 1
else:
    from_index = 1 
    to_index = 0

case_changer = ord('a') - ord('A')

for ch in password_in:
    letter_found = False

    for t in encryption_key:
        if ('a' <= ch and ch <= 'z') and ch == t[from_index]:  
            password_out = password_out + t[to_index]
            letter_found = True
        elif ('A' <= ch and ch <= 'Z') and chr(ord(ch) + 32) == t[from_index]:
            password_out = password_out + chr(ord(t[to_index]) - case_changer)
            letter_found = True
        elif (ch == '#' or ch == '@' or ch == '%') and ch == t[from_index]:
            password_out = password_out + t[to_index]
        elif (ch >= '0' and ch <= '9') and ch == t[from_index]:
            password_out = password_out + ch

# output
if encrypting:
    print('Your encrypted password is:', password_out)
else:
    print('Your decrypted password is:', password_out)

Answer 1

不需要正则表达式

import string
import sys

NON_ALPHABETIC_CHARACTERS = {'#', '@', '%'}
DIGITS_CHARACTERS = set(string.digits)
LETTERS_CHARACTERS = set(string.ascii_letters)


def validate_password_1(password,
                        non_alphabetic_characters=NON_ALPHABETIC_CHARACTERS,
                        digits_characters=DIGITS_CHARACTERS,
                        letters_characters=LETTERS_CHARACTERS):
    if not any(character in password
               for character in non_alphabetic_characters):
        err_msg = ('Password should contain at least '
                   'one non-alphabetic character.')
        print(err_msg)
        print('Invalid password!')
        sys.exit()

    if not any(character in password
               for character in digits_characters):
        err_msg = ('Password should contain at least '
                   'one digit character.')
        print(err_msg)
        print('Invalid password!')
        sys.exit()

    if not any(character in password
               for character in letters_characters):
        err_msg = ('Password should contain at least '
                   'one letter character.')
        print(err_msg)
        print('Invalid password!')
        sys.exit()


ALLOWED_CHARACTERS = (NON_ALPHABETIC_CHARACTERS
                      | DIGITS_CHARACTERS
                      | LETTERS_CHARACTERS)


def validate_password_2(password,
                        allowed_characters=ALLOWED_CHARACTERS):
    if not all(character in allowed_characters
               for character in password):
        print('Invalid password!')
        sys.exit()

添加了附加消息以查看给定密码到底出了什么问题