网络爬虫问题

import requests
import json
url="https://edu.cnblogs.com/Homework/GetAnswers?homeworkId=2420&_=1543752749008"
r=requests.get(url)
if r.status_code==200:
    pass
else:
    print(‘Error‘)
json_data=json.loads(r.text)
result=‘‘
for item in json_data[‘data‘]:
    u=str(item[‘StudentNo‘])+‘,‘+str(item[‘RealName‘])+‘,‘+str(item[‘Title‘])+‘,‘+str(item[‘DateAdded‘].replace(‘T‘,‘ ‘))+‘,‘+str(item[‘Url‘])
    result=result+u+‘\n‘
    print(u)
    with open(‘hwlist.csv‘,"w") as f:
        f.write(result)