python json文件及csv文件的读取和写入

#1、json文件存储
# import json
# str="""
# [{
#   "rating": ["9.2", "45"],
#   "rank": "21",
#   "cover_url": "https://img1.doubanio.com\/view\/photo\/s_ratio_poster\/public\/p511146807.jpg",
#   "is_playable": "false",
#   "id": "1292001",
#   "types": ["剧情", "音乐"],
#   "regions": ["意大利"]
#   },
#   {
#   "title": "海上钢琴师",
#   "url": "https:\/\/movie.douban.com\/subject\/1292001\/",
#   "release_date": "1998-10-28",
#   "actor_count": "5",
#   "vote_count": "687870",
#   "score": "9.2",
#   "actors": ["蒂姆·罗斯", "普路特·泰勒·文斯", "比尔·努恩", "梅兰尼·蒂埃里", "阿尔贝托·巴斯克斯"],
#   "is_watched": "false"
# }]"""
# print(type(str))
# data = json.loads(str)     #json不识别单引号，所有数据都得用双引号
# print(data)
# print(type(data))
# with open("./data.json","w") as f:
#     json.dump(data,f)
# with open("./data.json","r") as f:
#     a=json.load(f)
#     print(type(a))
#为了输出中文，需要指定参数
# with open("./data.json","w",encoding="utf-8") as f:
#     json.dump(data,f,ensure_ascii=False)

#2、CSV文件储存  表格形式
#1、写入
import csv
# with open('data.csv','w',newline='') as f:   #如果不写newline="",生成的列表中数据之间会多了一行换行
    # writer = csv.writer(f)
    # writer.writerow(["id","name","age"])
    # writer.writerow(["1001","lin","22"])
    # writer.writerow(["1002","lu","23"])
#可以调用参数，修改列与列之间的分隔符
# with open("data.csv","a") as f:
#     writer = csv.writer(f,delimiter = " ")    #写在了一个格子内了。。。。
#     writer.writerow(["1003","lin3","42"])
#可以调用writerrows()方法同时写入多行
    # writer.writerows([["1003","lin3","22"],["1004","lin4","44"]])
#一般情况下，爬虫爬取的数据都是结构化数据，一般用字典保存，csv中提供了字典的保存方式
    # filenames = ["id","name","age"]
    # writer = csv.DictWriter(f,fieldnames = filenames)
    # writer.writerow({'id':'1001',"name":"lin","age":"23"})
    # writer.writerow({'id':'1001',"name":"lin","age":"23"})
#csv文件读取
# with open('data.csv','r',encoding="utf-8") as f:
#     reader = csv.reader(f)
#     for row in reader:
#         print(row)