import requests

url = 'http://down.sandai.net/thunder9/Thunder9.0.18.448.exe'

filename = url.split('/')[-1]  #获取文件名

r = requests.get(url,stream = True)

with open(filename,'wb') as f:

    p = 0  #下载计数器

    chunk_size = 4096 #块大小

    try:

        while True:

            for data in r.iter_content(chunk_size):

                p += f.write(data)

                print('%d' % (p))

    except Exception as e:

        print(e)

    finally:

        print('下载完毕！')
        

import urllib.request

url = 'http://down.sandai.net/thunder9/Thunder9.0.18.448.exe'

resp = urllib.request.urlopen(url)

filename = url.split('/')[-1]

with open(filename,'wb') as f:

    p = 0 #下载计数

    buffsize = 4096 #块大小

    try:

        while True:

            buff = resp.read(buffsize)

            if not buff:    #buff为空，即下载完毕，结束循环

                break

            p += f.write(buff)

            print('%d' % p)

    except Exception as e:

        print(e)

    finally:

        print('下载完毕！')

import urllib

urllib.urlretrieve(url, ‘test.jpg’)