TypeError：列表索引必须是整数或切片，而不是解析列表时的str

Question

This is my code:

import requests
import json

res = requests.get("http://transport.opendata.ch/v1/connections? 
from=Baldegg_kloster&to=Luzern&fields[]=connections/from/prognosis/departure")

parsed_json = res.json()

print(parsed_json['connections']['from']['prognosis'])
"departure"

However, if I run it i get the following errors:

Traceback (most recent call last):
File "/home/pi/Desktop/Matura/v7/v7_test.py", line 10, in <module>
print(parsed_json['connections']['from']['prognosis'])
TypeError: list indices must be integers or slices, not str

I've looked at other similar Questions , but I didn't find a solution I am new to coding, so I have no Idea where the problem could be.

Answer 1

You have to parse the json like this based on your response,

import requests
import json

res = requests.get("http://transport.opendata.ch/v1/connections?\
from=Baldegg_kloster&to=Luzern&fields[]=connections/from/prognosis/departure")

parsed_json = res.json()

for item in parsed_json['connections']:
    print(item['from']['prognosis']['departure'])

Answer 2

First lets check the contents of parsed_json .

{'connections': [{'from': {'prognosis': {'departure': '2018-08-04T11:24:00+0200'}}}, {'from': {'prognosis': {'departure': '2018-08-04T11:53:00+0200'}}}, {'from': {'prognosis': {'departure': '2018-08-04T12:22:00+0200'}}}, {'from': {'prognosis': {'departure': None}}}]}

If you see the output, the children of connections is not a str but a list . You can't access an element in a list with a str , that's why you are getting that error.

So change

print(parsed_json['connections']['from']['prognosis'])

to

print(parsed_json['connections'][0]['from']['prognosis'])

You can change the 0 to the index of the element you want.