code: def pseudo_bytes(num):
      
      if num <= 0:
          raise ValueError("'num' should be > 0")
      buf = create_string_buffer(num)
      libcrypto.RAND_pseudo_bytes(buf, num)
      return buf.raw[:num]
docs: Returns num bytes of pseudo random data.  Pseudo- random byte
      sequences generated by pseudo_bytes() will be unique if
      they are of sufficient length, but are not necessarily
      unpredictable. They can be used for non-cryptographic purposes
      and for certain purposes in cryptographic protocols, but usually
      not for key generation etc.