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请各位大佬分享一下下载文件、视频或其他类型的经验链接和好文,拜谢!
小文件下载
下载小文件的话考虑的因素比较少,给了链接直接下载就好了:
import requests
image_url = "https://www.python.org/static/community_logos/python-logo-master-v3-TM.png"
r = requests.get(image_url) # create HTTP response object
with open("python_logo.png",'wb') as f:
f.write(r.content)
大文件下载
如果是小文件的话,一次性下载就OK了,但是如果文件比较大的话,那么下载下来的文件先放在内存中,内存还是比较有压力的。所以为了防止内存不够用的现象出现,我们要想办法把下载的文件分块写到磁盘中:
import requests
file_url = "http://codex.cs.yale.edu/avi/db-book/db4/slide-dir/ch1-2.pdf"
r = requests.get(file_url, stream=True)
with open("python.pdf", "wb") as pdf:
for chunk in r.iter_content(chunk_size=1024):
if chunk:
pdf.write(chunk)
批量文件下载:
批量文件下载的思路也很简单,首先读取网页的内容,再从网页中抽取链接信息,比如通过a标签,然后再从抽取出的链接中过滤出我们想要的链接,比如在本例中,我们只想下载MP4文件,那么我们可以通过文件名过滤所有链接:
import requests
from bs4 import BeautifulSoup
archive_url = "http://www-personal.umich.edu/~csev/books/py4inf/media/"
def get_video_links():
r = requests.get(archive_url)
soup = BeautifulSoup(r.content, 'html5lib')
links = soup.findAll('a')
video_links = [archive_url + link['href'] for link in links if link['href'].endswith('mp4')]
return video_links
def download_video_series(video_links):
for link in video_links:
file_name = link.split('/')[-1]
print("Downloading file:%s" % file_name)
r = requests.get(link, stream=True)
# download started
with open(file_name, 'wb') as f:
for chunk in r.iter_content(chunk_size=1024 * 1024):
if chunk:
f.write(chunk)
print("%s downloaded!\n" % file_name)
print("All videos downloaded!")
return
if __name__ == "__main__":
video_links = get_video_links()
download_video_series(video_links)
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