json的str类型和python类型的转换

parse_url.py

# coding=utf-8
import requests
from retrying import retry

headers={"User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36"}

@retry(stop_max_attempt_number=3)
def _parse_url(url,method,data,proxies):
    print("*"*20)
    if method=="POST":
        response = requests.post(url,data=data,headers=headers,proxies=proxies)
    else:
        response = requests.get(url,headers=headers,timeout=3,proxies=proxies)
    assert  response.status_code == 200
    return response.content.decode()


def parse_url(url,method="GET",data=None,proxies={}):
    try:
        html_str = _parse_url(url,method,data,proxies)
    except:
        html_str = None

    return html_str

if __name__ == '__main__':
    url = "www.baidu.com"
    print(parse_url(url))








import json
import requests
from parse_url import parse_url
from pprint import pprint

url = "https://m.douban.com/rexxar/api/v2/subject_collection/movie_showing/items?start=0&count=18&loc_id=108288"
html_str = parse_url(url)

# json.loads把json字符串转化为python类型
ret1 = json.loads(html_str)
# pprint(ret1)
# print(type(ret1))

# json.dumps能够把python类型转化为json字符串
with open("douban.json","w",encoding="utf-8") as f:
    f.write(json.dumps(ret1,ensure_ascii=False,indent=4))
    # f.write(str(ret1))

# with open("douban.json","r",encoding="utf-8") as f:
#     ret2 = f.read()
#     ret3 = json.loads(ret2)
#     print(ret3)
#     print(type(ret3))


# 使用json。load提取类文件对象中的数据
with open("douban.json","r",encoding="utf-8") as f:
    ret4 = json.load(f)
    print(ret4)
    print(type(ret4))

#json.dump能够把python类型放入类文件对象中
with open("douban1.json","w",encoding="utf-8") as f:
    json.dump(ret1,f,ensure_ascii=False,indent=2)