python知识点100篇系列（19）-使用python下载文件的几种方式

def downlaod1():
    import requests
    open ('download_file_1.png','wb').write(requests.get(url=downlaod_url).content)

def download2():
    import wget
    wget.download(downlaod_url,'download_file_2.png')

def d3(path,url):
    import requests
    rc = requests.get(url,stream=True)
    with open(path,'wb') as f:
        for r in rc:
            f.write(r)

def downlaod3():
    from multiprocessing.pool import ThreadPool
    ThreadPool(3).imap\_unordered(d3,['1.png','2.png','3.png'][downlaod\_url,downlaod\_url,downlaod\_url])
   

def download4():
    import urllib3 
    import shutil
    client = urllib3.PoolManager()
    with open('downlaod_file_4.png') as f, client.request('GET',downlaod_url) as res:
        shutil.copyfileobj(res,f)

async def d5(url):
    import requests
    open ('path','wb').write(requests.get(url).content)

import asyncio

async def run_func(urls):
    downlaod5 = [d5(url) for url in urls]
    done,appending = await asyncio.wait(downlaod5)
    for d in done:
        print(d.result())

event_loog = asyncio.get_event_loop()
event_loog.run_until_complete(run_func([downlaod_url,downlaod_url,downlaod_url]))