code: def create_pw(length=8, digits=2, upper=2, lower=2):
      
  
      seed(time())
  
      lowercase = string.ascii_lowercase
      uppercase = string.ascii_uppercase
      letters = string.ascii_letters
      password = list(
          chain(
              (choice(uppercase) for _ in range(upper)),
              (choice(lowercase) for _ in range(lower)),
              (choice(string.digits) for _ in range(digits)),
              (choice(letters) for _ in range((length - digits - upper - lower)))
          )
      )
  
      return "".join(sample(password, len(password)))
docs: Create a random password
      From Stackoverflow:
      http://stackoverflow.com/questions/7479442/high-quality-simple-random-password-generator
  
      Create a random password with the specified length and no. of
      digit, upper and lower case letters.
  
      :param length: Maximum no. of characters in the password
      :type length: int
  
      :param digits: Minimum no. of digits in the password
      :type digits: int
  
      :param upper: Minimum no. of upper case letters in the password
      :type upper: int
  
      :param lower: Minimum no. of lower case letters in the password
      :type lower: int
  
      :returns: A random password with the above constaints
      :rtype: str