Python入门100题之012检查密码

　　题目：
　　输入一个密码，检查是否有效。
　　有效标准：
　　长度在6~12；
　　至少包含1个小写字母和1个大写字母；
　　至少包含1个数字；
　　至少包含1个特殊符号；
　　视频教程：
　　Python入门100题之012：检查密码
　　代码1： line = input(＂输入密码：＂)   def is_valid(password: str):     has_lower_letter = False     has_upper_letter = False     has_number = False     has_symbol = False     has_length = False      symbols = ＂`-=[];＂,./~!@#$%^&*()_+{}|:＂<>?＂      for c in password:         if c.islower():             has_lower_letter = True         elif c.isupper():             has_upper_letter = True         elif c.isnumeric():             has_number = True         elif c in symbols:             has_symbol = True         else:  # 避免其他符号，比如 emoji，中文，空格等             return False      if 6 <= len(password) <= 12:         has_length = True     return has_lower_letter and has_upper_letter and has_number and has_symbol and has_length   print(is_valid(line))
　　代码2： line = input(＂输入密码：＂)   def is_valid(password: str):     has_lower_letter = False     has_upper_letter = False     has_number = False     has_symbol = False     has_length = False      symbols = ＂`-=[];＂,./~!@#$%^&*()_+{}|:＂<>?＂      for c in password:         if c.islower():             has_lower_letter = True         elif c.isupper():             has_upper_letter = True         elif c.isnumeric():             has_number = True         elif c in symbols:             has_symbol = True         else:             return False      if 6 <= len(password) <= 12:         has_length = True      return all([         has_lower_letter,         has_upper_letter,         has_number,         has_symbol,         has_length,     ])   print(is_valid(line))
　　代码3： line = input(＂输入密码：＂)   def is_valid(password: str):     has_lower_letter = False     has_upper_letter = False     has_number = False     has_symbol = False     has_length = False     has_invalid = False     reasons = []      symbols = ＂`-=[];＂,./~!@#$%^&*()_+{}|:＂<>?＂      for c in password:         if c.islower():             has_lower_letter = True         elif c.isupper():             has_upper_letter = True         elif c.isnumeric():             has_number = True         elif c in symbols:             has_symbol = True         else:             has_invalid = True      if 6 <= len(password) <= 12:         has_length = True      if not has_lower_letter:         reasons.append(＂至少包含一个小写字母＂)     if not has_upper_letter:         reasons.append(＂至少包含一个大写字母＂)     if not has_number:         reasons.append(＂至少包含一个数字＂)     if not has_symbol:         reasons.append(＂至少包含一个特殊符号＂)     if not has_length:         reasons.append(＂长度要在6~12＂)     if has_invalid:         reasons.append(＂包含非法字符＂)      return all([         has_lower_letter,         has_upper_letter,         has_number,         has_symbol,         has_length,         not has_invalid,     ]), reasons   valid, reasons = is_valid(line) print(valid) print(＂======＂) print(＂ ＂.join(reasons))