code: def make_message(api_secret, enc_func=False, **params):
      
      if 'nonce' not in params:
          params['nonce' ] = str(int(time.time()))
      params['sign'] = make_sign(api_secret, params.values())
      msg = json.dumps(params, ensure_ascii=False)
      if callable(enc_func):
          return enc_func(msg)
      else:
          return msg
docs: >>> json.loads(make_message("123456",**dict(code=1,msg=u"中文",nonce=1451122677)))['sign']
          u'58BAF40309BC1DC51D2E2DC43ECCC1A1'