Question

我知道在这里Accessing key, value in a nested dictionary和这里：python accessing elements in a dictionary inside dictionary等地方都提出了一些相关的问题，但是我似乎不太愿意将答案的方法论应用于我的问题。

我在尝试访问response_dict中的键时遇到KeyError，我知道这是由于它被嵌套/分页并且我以错误的方式进行操作。有人可以帮助和/或指出正确的方向吗？

import requests
import json
URL = "https://api.constantcontact.com/v2/contacts?status=ALL&limit=1&api_key=<redacted>&access_token=<redacted>"
#make my request, store it in the requests object 'r'
r = requests.get(url = URL)
#status code to prove things are working
print (r.status_code)
#print what was retrieved from the API
print (r.text)
#visual aid
print ('---------------------------')
#decode json data to a dict
response_dict = json.loads(r.text)
#show how the API response looks now
print(response_dict)
#just for confirmation
print (type(response_dict))
print('-------------------------')
# HERE LIES THE ISSUE
print(response_dict['first_name'])

我的输出：

200
{"meta":{"pagination":{}},"results":[{"id":"1329683950","status":"ACTIVE","fax":"","addresses":[{"id":"4e19e250-b5d9-11e8-9849-d4ae5275509e","line1":"222 Fake St.","line2":"","line3":"","city":"Kansas City","address_type":"BUSINESS","state_code":"","state":"OK","country_code":"ve","postal_code":"19512","sub_postal_code":""}],"notes":[],"confirmed":false,"lists":[{"id":"1733488365","status":"ACTIVE"}],"source":"Site Owner","email_addresses":[{"id":"1fe198a0-b5d5-11e8-92c1-d4ae526edd6c","status":"ACTIVE","confirm_status":"NO_CONFIRMATION_REQUIRED","opt_in_source":"ACTION_BY_OWNER","opt_in_date":"2018-09-11T18:18:20.000Z","email_address":"rsmith@fake.com"}],"prefix_name":"","first_name":"Robert","middle_name":"","last_name":"Smith","job_title":"I.T.","company_name":"FBI","home_phone":"","work_phone":"5555555555","cell_phone":"","custom_fields":[],"created_date":"2018-09-11T15:12:40.000Z","modified_date":"2018-09-11T18:18:20.000Z","source_details":""}]}
---------------------------
{'meta': {'pagination': {}}, 'results': [{'id': '1329683950', 'status': 'ACTIVE', 'fax': '', 'addresses': [{'id': '4e19e250-b5d9-11e8-9849-d4ae5275509e', 'line1': '222 Fake St.', 'line2': '', 'line3': '', 'city': 'Kansas City', 'address_type': 'BUSINESS', 'state_code': '', 'state': 'OK', 'country_code': 've', 'postal_code': '19512', 'sub_postal_code': ''}], 'notes': [], 'confirmed': False, 'lists': [{'id': '1733488365', 'status': 'ACTIVE'}], 'source': 'Site Owner', 'email_addresses': [{'id': '1fe198a0-b5d5-11e8-92c1-d4ae526edd6c', 'status': 'ACTIVE', 'confirm_status': 'NO_CONFIRMATION_REQUIRED', 'opt_in_source': 'ACTION_BY_OWNER', 'opt_in_date': '2018-09-11T18:18:20.000Z', 'email_address': 'rsmith@fake.com'}], 'prefix_name': '', 'first_name': 'Robert', 'middle_name': '', 'last_name': 'Smith', 'job_title': 'I.T.', 'company_name': 'FBI', 'home_phone': '', 'work_phone': '5555555555', 'cell_phone': '', 'custom_fields': [], 'created_date': '2018-09-11T15:12:40.000Z', 'modified_date': '2018-09-11T18:18:20.000Z', 'source_details': ''}]}
<class 'dict'>
-------------------------
Traceback (most recent call last):
  File "C:\Users\rkiek\Desktop\Python WIP\Chris2.py", line 20, in <module>
    print(response_dict['first_name'])
KeyError: 'first_name'

Answer 1

first_name = response_dict["results"][0]["first_name"]

尽管我认为您可以通过阅读一些文档来更好地回答这个问题，但我将解释这里发生的情况。您会看到名为“罗伯特”的人的字典对象在列表中，该列表是键“结果”下的值。因此，首先，您需要访问结果中的值，即python-list。

然后，您可以使用循环遍历列表中的每个元素，并将每个单独的元素视为常规字典对象。

results = response_dict["results"]
results = response_dict.get("results", None) 
# use any one of the two above, the first one will throw a KeyError if there is no key=="results" the other will return NULL
# this results is now a list according to the data you mentioned.

for item in results:
    print(item.get("first_name", None)
# here you can loop through the list of dictionaries and treat each item as a normal dictionary

访问分页/嵌套词典中的键/值

1 个答案: