python网络爬虫作业

import requests
import json
url="https://edu.cnblogs.com/Homework/GetAnswers?homeworkId=2420&_=1543656520026"
def getHTMLText(url):
    try:
        r=requests.get(url,timeout=30)
        r.raise_for_status() #如果状态不是200，引发异常
        r.encoding=‘utf-8‘ #无论原来什么编码都改成utf-8
        datas=json.loads(r.text)[‘data‘]
    except:
        print(‘error‘)
    else:
        result=" "
        for item in datas:
            result += str(item[‘StudentNo‘])+‘,‘+item[‘RealName‘]+‘,‘+item[‘DateAdded‘].replace(‘T‘,‘ ‘)+‘,‘+item[‘Title‘]+‘,‘+item[‘Url‘]+‘\n‘
        f=open(‘D:\hwlist.csv‘,‘w‘)
        f.write(result)
        f.close()