python实现密码强度校验

"""
  作者：zhengzhihui
  版本：7.0
  日期：2019/7/13
  功能：判断密码强度
  2.0功能：循环和终止
  3.0功能：将密码保存到文本中
  4.0功能：读取文件，遍历文件
  5.0功能：定义PasswordTool类
  6.0功能：定义FileTool类
  7.0功能：密码中增加大小写字母和特殊字符['+', '-', '*', '/', '_', '&', '%', ',']
"""
import time as tm
 
 
class FileTool():
  """
    文件工具类
  """
  def __init__(self, filepath):
    self.filepath = filepath
 
  def write_to_file(self, content):
    with open(self.filepath, 'a') as f:
      f.write(content)
 
  def read_from_file(self):
    with open(self.filepath, 'r') as f:
      content = f.readlines()
    return content
 
 
class PasswordTool():
  """
    密码工具类
  """
  def __init__(self, password):
    self.password = password
    self.strength_level = 0
 
  def check_number_exist(self):
    """
      判断是否含数字
    """
    has_number = False
    for c in self.password:
      if c.isnumeric():
        has_number = True
        break
    return has_number
 
  def check_letter_exist(self):
    """
      判断是否含字母
    """
    has_upper_letter = False
    has_lower_letter = False
    for c in self.password:
      if c.isupper():
        has_upper_letter = True
      elif c.islower():
        has_lower_letter = True
      has_both_letter = has_upper_letter and has_lower_letter
      if has_both_letter:
        break
    return has_both_letter
 
  def check_specialchar_exist(self):
    """
      判断是否包含特殊字符
    """
    has_specialchar = False
    specialchar_list = ['+', '-', '*', '/', '_', '&', '%', ',']
    for c in self.password:
      if c in specialchar_list:
        has_specialchar = True
        break
    return has_specialchar
 
  def process_password(self):
    """
      判断是否符合规则
    """
    # 规则1：长度至少8位
    if len(self.password) >= 8:
      self.strength_level += 1
    else:
      print('密码长度至少8位')
 
    # 规则2：必须包含数字
    if self.check_number_exist():
      self.strength_level += 1
    else:
      print('密码需要包含数字')
 
    # 规则3：必须包含大小写字母
    if self.check_letter_exist():
      self.strength_level += 1
    else:
      print('密码需要包含大小写字母')
 
    # 规则4：需要包含特殊字符
    if self.check_specialchar_exist():
      self.strength_level += 1
    else:
      print('密码需要包含至少一个特殊字符("+,-,*,/,_")')
 
 
def main():
  """
    主函数
  """
  try_times = 5
  pwd_strength_dict = {0: '弱', 1: '较弱', 2: '中', 3: '强', 4: '超强'}
  myfile = FileTool("password_7.0.txt")
 
  while try_times > 0:
    password = input('请输入密码: ')
    mypwdtool = PasswordTool(password)
    mypwdtool.process_password()
 
    now_time = tm.strftime("%Y-%m-%d %H:%M:%S", tm.localtime())
    myfile.write_to_file("日期:{} 密码:{} 强度:{}{}\n".format(now_time, password,
                          mypwdtool.strength_level, pwd_strength_dict[mypwdtool.strength_level]))
 
    if mypwdtool.strength_level >= 4:
      print('恭喜！密码合格')
      break
    else:
      print('密码不合格')
      try_times -= 1
      print()
  if try_times <= 0:
    print('尝试次数过多，密码设置失败!')
 
  content = myfile.read_from_file()
  print(content)
 
 
if __name__ == "__main__":
  main()