我试图从将数据作为 JSON 对象返回的 API 中提取数据。我有一个 API 调用，它返回看起来像这样的数据（为简洁起见，这里缩短了）
"status":"OK",
"copyright":"Copyright (c) 2017 Pro Publica Inc. All Rights Reserved.",
"results":[
{
"num_results": 10,
"offset": 0,
"bills": [
{
"bill_id": "hr2739-113",
"bill_type": "hr",
"number": "H.R.2739",
"bill_uri": "https://api.propublica.org/congress/v1/113/bills/hr2739.json",
"title": "Efficient Use of Government Spectrum Act of 2013",
"sponsor_title": "Rep.",
"sponsor_id": "M001163",
"sponsor_name": "Doris Matsui",
"sponsor_state": "CA",
"sponsor_party": "D",
"sponsor_uri": "https://api.propublica.org/congress/v1/members/M001163.json",
"gpo_pdf_uri": "http://www.gpo.gov/fdsys/pkg/BILLS-113hr2739ih/pdf/BILLS-113hr2739ih.pdf",
"congressdotgov_url": "https://www.congress.gov/bill/113th-congress/house-bill/2739",
"govtrack_url": "https://www.govtrack.us/congress/bills/113/hr2739",
"introduced_date": "2013-07-18",
"committees": "House Armed Services Committee",
"committee_codes": ["HSAS","HSIF"],
"subcommittee_codes": ["HSAS26","HSIF16"],
"primary_subject": "Science, Technology, Communications",
"summary_short": "Efficient Use of Government Spectrum Act of 2013 - Directs the Federal Communications Commission (FCC), within three years after enactment of the Middle Class Tax Relief and Job Creation Act of 2012, to: (1) reallocate electromagnetic spectrum between the frequencies from 1755 to 1780 megahertz (currently, such frequencies are occupied by the Department of Defense [DOD] and other federal agencies); and (2) as part of the competitive bidding auctions required by such Act, grant new initial lic...",
"latest_major_action_date": "2013-08-29",
"latest_major_action": "Referred to the Subcommittee on Intelligence, Emerging Threats & Capabilities."
},
{
"bill_id": "hr3355-113",
"bill_type": "hr",
"number": "H.R.3355",
"bill_uri": "https://api.propublica.org/congress/v1/113/bills/hr3355.json",
"title": "Reducing Employer Burdens, Unleashing Innovation, and Labor Development Act of 2013",
"sponsor_title": "Rep.",
"sponsor_id": "G000558",
"sponsor_name": "Brett Guthrie",
"sponsor_state": "KY",
"sponsor_party": "R",
"sponsor_uri": "https://api.propublica.org/congress/v1/members/G000558.json",
"gpo_pdf_uri": "http://www.gpo.gov/fdsys/pkg/BILLS-113hr3355ih/pdf/BILLS-113hr3355ih.pdf",
"congressdotgov_url": "https://www.congress.gov/bill/113th-congress/house-bill/3355",
"govtrack_url": "https://www.govtrack.us/congress/bills/113/hr3355",
"introduced_date": "2013-10-28",
"committees": "House Armed Services Committee",
"primary_subject": "Economics and Public Finance",
"summary_short": "Reducing Employer Burdens, Unleashing Innovation, and Labor Development Act of 2013 - Expresses the sense of Congress that increasing the competitiveness of U.S. manufacturers will strengthen the national economy. Title I: Investing in America's Workforce - Investing in America's Workforce Act - Amends the Workforce Investment Act of 1998 to require state or local workforce investment systems to use youth activities funds allocated to a local area for programs that provide training, which may...",
"latest_major_action_date": "2014-01-24",
"latest_major_action": "Referred to the Subcommittee on Intelligence, Emerging Threats & Capabilities."
},
使用 Python，我试图遍历数据并返回所有值，如下所示：
import requests
import json
r = requests.get({url and credentials here}).text
resp = json.loads(r)
for bill in resp['results']['bills']:
name = bill['results']['bills']['title']
type = item['results']['bills']['bill_type']
print(name, type)
但是，每当我尝试运行它时，我都会得到
TypeError: list indices must be integers or slices, not str
为什么我不能使用列表索引作为 str？有很多使用 str 的例子。
json 中的“账单”是一个对象列表（例如"bills" : [- 左括号是正方形，这意味着一个列表）。
您必须使用整数来访问列表的元素，因此您可以说；
resp['results'][0]['bills'][0]
例如，访问第一个账单。
但是，您的代码在循环中有点混乱，bill变量将包含每个帐单的信息，因此您可以直接引用键，例如循环遍历第一个结果中的帐单
for bill in resp['results'][0]['bills']:
name = bill['title']
type = bill['bill_type']
print(name, type)
变量'name' 和'type' 将只包含循环块中每张账单的详细信息。
您可以嵌套循环以遍历所有结果
for result in resp['results']:
for bill in result['bills']:
name = bill['title']
type = bill['bill_type']
print(name, type)
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