def uploadmedia(imgname):

    url_api = 'https://oapi.dingtalk.com/media/upload?access_token='

    upload_url = url_api + access_token + str('&type=image') #access_token=234567890自己的ID

    register_openers()

    datagen, headers = multipart_encode({"media": open(imgname, "rb")})

    # headers = {"Content-Type":"application/json", "Charset":"utf8"}

    request = urllib2.Request(upload_url, datagen, headers)

    result = urllib2.urlopen(request).read()

    result = json.loads(result)

    return result.get('media_id')

media_id = uploadmedia(imgname)

print media_id