python 爬虫保存文件的几种方法

import os
os.makedirs('./img/', exist_ok=True)IMAGE_URL = "https://morvanzhou.github.io/static/img/description/learning_step_flowchart.png"def urllib_download():
from urllib.request import urlretrieve
urlretrieve(IMAGE_URL, './img/image1.png') # whole documentdef request_download():
import requests
r = requests.get(IMAGE_URL)
with open('./img/image2.png', 'wb') as f:
f.write(r.content) # whole documentdef chunk_download():
import requests
r = requests.get(IMAGE_URL, stream=True) # stream loading with open('./img/image3.png', 'wb') as f:
for chunk in r.iter_content(chunk_size=32):
f.write(chunk)urllib_download()
print('download image1')
request_download()
print('download image2')
chunk_download()
print('download image3')