code: def random(cls, length, bit_prob=.5):
          
  
          assert isinstance(length, int) and length >= 0
          assert isinstance(bit_prob, (int, float)) and 0 <= bit_prob <= 1
  
          bits = 0
          for _ in range(length):
              bits <<= 1
              bits += (random.random() < bit_prob)
  
          return cls(bits, length)
docs: Create a bit string of the given length, with the probability of
          each bit being set equal to bit_prob, which defaults to .5.
  
          Usage:
              # Create a random BitString of length 10 with mostly zeros.
              bits = BitString.random(10, bit_prob=.1)
  
          Arguments:
              length: An int, indicating the desired length of the result.
              bit_prob: A float in the range [0, 1]. This is the probability
                  of any given bit in the result having a value of 1; default
                  is .5, giving 0 and 1 equal probabilities of appearance for
                  each bit's value.
          Return:
              A randomly generated BitString instance of the requested
              length.