code: def random_number(self, digits=None, fix_len=False):
          
          if digits is None:
              digits = self.random_digit()
          if fix_len:
              return self.generator.random.randint(
                  pow(10, digits - 1), pow(10, digits) - 1)
          else:
              return self.generator.random.randint(0, pow(10, digits) - 1)
docs: Returns a random number with 1 digit (default, when digits==None),
          a random number with 0 to given number of digits, or a random number
          with given number to given number of digits (when ``fix_len==True``).
  
          :param digits: maximum number of digits
          :param fix_len:  should the number have fixed length?
          :returns: random number with 0 to given number of digits or
              fixed length number