1、NotImplementedError
import tornado.ioloop
import tornado.web
import tornado.httpserver
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, Nowamagic")
application = tornado.web.Application([(r"/", MainHandler)])
# httpServer = tornado.httpserver.HTTPServer(application)
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
解決方法:
https://ask.csdn.net/questions/1054691
找到tornado/platform/asyncio.py 文件
在文件裏面加上
import sys
if sys.platform == 'win32':
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
2、json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
import json
import tornado.httpclient
http_client = tornado.httpclient.HTTPClient()
try:
response = http_client.fetch("https://news-at.zhihu.com/api/4/news/latest")
# print(response.body)
except httpclient.HTTPError as e:
print("Error:", e)
http_client.close()
調用url出來的數據是bytes類型,想變成json類型,先轉換成str,然後再轉換成json發現有報錯
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
經過查找發現是,沒有轉換成 utf-8 編碼
data_str = str(data.decode(encoding='utf-8'))
轉換後即可
3. urllib2.Request(url,head,data) 內部參數
head :dict類型
data :str類型,同時,發起請求所含的必要參數應當在當中。如同postman中的body一樣。
4. urlopen()獲取頁面,返回類型爲bytes,需要用decode解碼,轉換成str類型