code: def randbytes(nbytes: int) -> bytes:
      r
      if not isinstance(nbytes, int):
          raise TypeError('number of bytes shoud be an integer')
      if nbytes <= 0:
          raise ValueError('number of bytes must be greater than zero')
  
      return _urandom(nbytes)
docs: r"""Return a random byte string containing *nbytes* bytes.
  
      Raises ValueError if nbytes <= 0, and TypeError if it's not an integer.
  
      >>> randbytes(16)  #doctest:+SKIP
      b'\\xebr\\x17D*t\\xae\\xd4\\xe3S\\xb6\\xe2\\xebP1\\x8b'