import re

def check_password(password):
    # 檢查長度是否在6-20之間
    if not 6 <= len(password) <= 20:
        return False
    # 檢查是否包含小寫字母
    if not re.search(r'[a-z]',password):
        return False
    # 檢查是否包含大寫字母
    if not re.search(r'[A-Z]',password):
        return False
    # 檢查是否包含數(shù)字
    if not re.search(r'[0-9]',password):
        return False
    # 檢查是否包含特殊字符
    if not re.search(r'[!@#$%^&*()_+-=,.<>?]',password):
        return False
    return True

# 測試
password = "Abc123!@"
print(check_password(password)) # True
password = "abc"
print(check_password(password)) # False

import re

password_pattern = re.compile(r'^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[!@#$%^&*()_+-=,.<>?])[A-Za-z\d!@#$%^&*()_+-=,.<>?]{6,20}$')

# 測試
password = "Abc123!@"
print(bool(password_pattern.match(password))) # True
password = "abc"
print(bool(password_pattern.match(password))) # False

import re
 
while True:
    pwd = input('請輸入您的密碼：')
    r = '^(?=.*?\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[~!@])[0-9a-zA-Z~!@]{6}$'
    result = re.match(r, pwd)
    if result is None:
        print('請輸入正確的密碼格式！')
        print('要求6位密碼，含有數(shù)字、大小寫字母,及~！@中的特殊符號!')
    else:
        break
 
print('成功設(shè)置密碼！')
print(f'您的密碼是：{pwd}')

    # 若不限制長度
    r = '^(?=.*?\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[~!@]).*$'