1. W1 - requests 库

关键是 requests.get() 函数， 具体可参考：Doc - Requests.

import requests

img_url = 'http://xxx.com/test.jpg'
img_file = 'test.jpg'

response = requests.get(image_url, timeout=3)

if response.status_code == 200: # if response.status_code == requests.codes.ok
    with open(img_file, "wb") as fp:
        fp.write(response.content)

timeout=3 表示在 3s 后停止请求等待. Requests - Timeouts.

2. W2 - urllib.request 库

import urllib.request

img_url = 'http://xxx.com/test.jpg'
img_file = 'test.jpg'

urllib.request.urlretrieve(img_url, filename=img_file)

3. W3 - wget 库

安装：

 pip install wget 

import wget

img_url = 'http://xxx.com/test.jpg'
img_file = 'test.jpg'

# 获取文件名
file_name = wget.filename_from_url(img_url)
print(file_name) 

# 下载文件, 默认文件名
file_name = wget.download(img_url)
print(file_name) 

# 下载文件，指定文件名
file_name = wget.download(img_url, out=img_file)
print(file_name)