input: def generate_password():
      """ Generate a random password with a minimum length of 8 characters, 
      containing at least one number and one special character.
      >>> len(generate_password()) == 8
      True
      >>> any(char.isdigit() for char in generate_password())
      True
      >>> any(char in string.punctuation for char in generate_password())
      True
      """
      length = 8
      chars = string.ascii_letters + string.digits + string.punctuation
      password = "".join(random.choice(chars) for i in range(length))
      return password
output:     while not (any(char.isdigit() for char in password) and any(char in string.punctuation for char in password)):
          password = "".join(random.choice(chars) for i in range(length))
      return password