高德地图API爬取，代码运行之后出现KeyError

Question

高德地图API爬取，代码运行之后出现KeyError（‘cost’），是为什么呀？

以下是源码：

import json
from urllib import request

OD=open('od_walking.txt').read().splitlines()

url_base='https://restapi.amap.com/v5/direction/bicycling?parameters&key=47e4ca6d9cd2c2e62b9e300dcd1a8370&origin={0},{1}&destination={2},{3}'

output=open('one_wsy.txt','wb')

for i in OD:
    x1,y1,x2,y2=i.split('\t')
    url=url_base.format(x1,y1,x2,y2)
    try:
        html=request.urlopen(url,timeout=15).read()
        js=json.loads(html)
        d=js['route']['paths'][0]['distance']
        c=js['route']['paths'][0]['cost']['duration']
        out='{0}\t{1}\n'.format(d,c)
        output.write(out.encode('utf8'))
    except Exception as e:
        print(repr(e))
        output.write(url.encode('utf8'))

output.close()

Answer 1

报错显示不存在cost这个键，你可以看下js['route']['paths'][0]