异步的最好案例应该是爬这种多页面的或者多级的东西，所以直接整小说

直接百度小说

随便点一本小说，然后打开调试

找到加载章节的数据包

然后保存这个包的url地址

点一个章节进去，然后又看一下包

 看到了内容，url也复制一下

# https://dushu.baidu.com/api/pc/getCatalog?data={%22book_id%22:%224356290733%22}
# https://dushu.baidu.com/api/pc/getChapterContent?data={%22book_id%22:%224356290733%22,%22cid%22:%224356290733|1569830905%22,%22need_bookinfo%22:1}

发现有%22这玩意，直接去掉

然后对第一个url进行请求

def getCatalog(url):   # url 传参
    resp = requests.get(url)
    print(resp.text)  # 同步以获取小说信息


if __name__ == '__main__':
    bok_id = "4356290733"
    url = 'https://xxxxx.com/api/pc/getCatalog?data={"book_id":"' + bok_id + '"}'
    getCatalog(url)

因为是数据包，所以直接用json输出，然后定位到title的位置，以获取title和cid

因为每个cid对应每一章节，所以开始上异步

修改代码下

async def aiodownload(cid,bok_id,title):
    data = {"book_id":"4356290733","cid":"4356290733|1569830905","need_bookinfo":1}
    pass
async def getCatalog(url):
    resp = requests.get(url)
    # print(resp.text)
    dic = resp.json()
    tasks = []
    for item in dic['data']['novel']['items']:
        title = item['title']
        cid = item['cid']
        # 准备异步任务
        tasks.append(aiodownload(cid,bok_id,title))
        # print(title,cid)

    await asyncio.wait(tasks)

if __name__ == '__main__':
    bok_id = "4356290733"
    url = 'https://dushu.baidu.com/api/pc/getCatalog?data={"book_id":"' + bok_id + '"}'
    asyncio.run(getCatalog(url))

 仔细看一下data那一行的数据，可以改成

data = {"book_id":bok_id,"cid":f"{bok_id}|{cid}","need_bookinfo":1}

 对于第一个url就是获取所有章数的，就是如下所示了

async def aiodownload(cid,bok_id,title):
    data = {"book_id":bok_id,"cid":bok_id|cid,"need_bookinfo":1}
    data = json.dumps(data)  # 改为字符串
    url = f'https://xxxx.com/api/pc/getChapterContent?data={data}'

    async with aiohttp.ClientSession() as sesion:
        async with sesion.get(url) as resp:
            dic = await resp.json()
            


async def getCatalog(url):
    resp = requests.get(url)
    # print(resp.text)
    dic = resp.json()
    tasks = []
    for item in dic['data']['novel']['items']:
        title = item['title']
        cid = item['cid']
        # 准备异步任务
        tasks.append(aiodownload(cid,bok_id,title))
        # print(title,cid)

    await asyncio.wait(tasks)

if __name__ == '__main__':
    bok_id = "4356290733"
    url = 'https://xxx.xxx.com/api/pc/getCatalog?data={"book_id":"' + bok_id + '"}'
    asyncio.run(getCatalog(url))

内容就简单了

 dic = await resp.json()
            async with aiofiles.open(title,mode="w",encoding="utf-8") as f:
                await f.write(dic['data']['novel']['content']) # 把小说内容写入

全部代码如下

import asyncio, aiohttp, aiofiles
import json
import requests


async def aiodownload(cid, bok_id, title):
    data = {"book_id": bok_id, "cid": f"{bok_id}|{cid}", "need_bookinfo": 1}
    data = json.dumps(data)  # 改为字符串
    url = f'https://xxxx.com/api/pc/getChapterContent?data={data}'
    async with aiohttp.ClientSession() as sesion:
        async with sesion.get(url) as resp:
            dic = await resp.json()
            async with aiofiles.open(title, mode="w", encoding="utf-8") as f:
                await f.write(dic['data']['novel']['content'])  # 把小说内容写入


async def getCatalog(url):
    resp = requests.get(url)
    # print(resp.text)
    dic = resp.json()
    tasks = []
    for item in dic['data']['novel']['items']:
        title = item['title']
        cid = item['cid']
        # 准备异步任务
        tasks.append(aiodownload(cid, bok_id, title))
        # print(title,cid)
    await asyncio.wait(tasks)


if __name__ == '__main__':
    bok_id = "4356290733"
    url = 'https://xxx.com/api/pc/getCatalog?data={"book_id":"' + bok_id + '"}'
    asyncio.run(getCatalog(url))