使用python如何提取JSON数据指定内容

{'err_no': 0, 'err_str': 'OK', 'pic_id': '1169213517976400008', 'pic_str': 'xoet', 'md5': 'ca9bc4fda521498d2b3aba5dbb4ee4ac'}

import json
?
str = "{'err_no': 0, 'err_str': 'OK', 'pic_id': '1169213517976400008', 'pic_str': 'xoet', 'md5': 'ca9bc4fda521498d2b3aba5dbb4ee4ac'}"
json_str = str.replace("'",'"')
# json.loads() ,要求json串格式中必须的双引号！！转换为字典
json_dict = json.loads(dict2)
print(json_dict['pic_str'])
>> xoet

import json
?
json_dict = {'err_no': 0,'err_str': 'OK', 'pic_id': '1169213517976400008', 'pic_str': 'xoet', 'md5': 'ca9bc4fda521498d2b3aba5dbb4ee4ac'}
# 方法一
print(json_dict['pic_str'])
# 或者使用 print(json_dict.get('pic_str'))
?
# 方法二:遍历
for pic in json_dict['pic_str'}:
? ? print(pic)

{
? "familyName": "thinker family",
? "homeTown": "广东省",
? "formed": 2016,
? "secretBase": "Super city",
? "active": true,
? "familyMembers": [
? ? {
? ? ? "name": "Jobs",
? ? ? "age": 35,
? ? ? "secretIdentity": "1992238132345",
? ? ? "powers": [
? ? ? ? "Radiation resistance",
? ? ? ? "Turning tiny",
? ? ? ? "Radiation blast"
? ? ? ]
? ? },
? ? {
? ? ? "name": "James",
? ? ? "age": 37,
? ? ? "secretIdentity": "8839394098124",
? ? ? "powers": [
? ? ? ? "Million tonne punch",
? ? ? ? "Damage resistance",
? ? ? ? "Superhuman reflexes"
? ? ? ]
? ? }
? ]
}

member = [ members.get('name') for members in data.get('familyMembers') ]

extract_element_from_json(data, ["familyMembers", "name"])
>> ['Jobs', 'James']

def extract_element_from_json(obj, path):
    '''
    输入关键字，就可以将关键字的值信息存放在列表中并输出
    如果关键字是对象名，则返回的对象字典信息到列表中
    如果关键字是列表名，则返回的列表信息到列表中（返回双重列表）
    '''
    def extract(obj, path, ind, arr):
    	'''
    	从一个嵌套的字典中提取一个元素，并返回到列表中。
        params: obj - dict - 输入字典
        params: path - list - 构成JSON路径的字符串列表
        params: ind - int - 起始索引
        params: arr - 列表 - 输出列表
    	'''
        key = path[ind]
        if ind + 1 < len(path):
            if isinstance(obj, dict):
                if key in obj.keys():
                    extract(obj.get(key), path, ind + 1, arr)
                else:
                    arr.append(None)
            elif isinstance(obj, list):
                if not obj:
                    arr.append(None)
                else:
                    for item in obj:
                        extract(item, path, ind, arr)
            else:
                arr.append(None)
        if ind + 1 == len(path):
            if isinstance(obj, list):
                if not obj:
                    arr.append(None)
                else:
                    for item in obj:
                        arr.append(item.get(key, None))
            elif isinstance(obj, dict):
                arr.append(obj.get(key, None))
            else:
                arr.append(None)
        return arr
    if isinstance(obj, dict):
        return extract(obj, path, 0, [])
    elif isinstance(obj, list):
        outer_arr = []
        for item in obj:
            outer_arr.append(extract(item, path, 0, []))
        return outer_arr

extract_element_from_json(data, ["familyMembers", "name"])

import requests
url = "http://ip-api.com/json"
response = requests.request("GET", url)
data = response.json()
extract_element_from_json(data, ["status"])