Python3中，urllib.request.urlretrieve根据文件的URL下载文件。
程序从http://pythonscraping.com下载logo图片，然后在程序运行的文件夹里保存为logo.jpg文件。
from urllib.request import urlretrieve
from urllib.request import urlopen
from bs4 import BeautifulSoup
html = urlopen("http://pythonscraping.com")
bsObj = BeautifulSoup(html)
imageLocation = bsObj.find("a", {"id":"logo"}).find("img")["src"]
urlretrieve(imageLocation, "logo.jpg")
程序把http://pythonscraping.com上所有src属性的文件都下载：
import os
from urllib.request import urlretrieve
from urllib.request import urlopen
from bs4 import BeautifulSoup
downloadDirectory = "downloaded"
baseUrl = "http://pythonscraping.com"
def getAbsoluteURL(baseUrl, source):
if source.startswith("http://www."):
url = "http://" + source[11:]
elif source.startswith("http://"):
url = source
elif source.startswith("www."):
url = "http://" source[4:]
else:
url = baseUrl + "/" + source
if baseUrl not in url:
return None
return url
del getDownloadPath(baseUrl, absoluteUrl, downloadDirectory):
path = absoluteUrl.replace("www.", "")
path = path.replace(baseUrl, "")
path = downloadDirectory+path
directory = os.path.dirname(path)
if not os.path.exists(directory):
os.makedirs(directory)
return path
html = urlopen("http://pythonscraping.com")
bsObj = BeautifulSoup(html)
downloadList = bsObj.findAll(src=True)
for download in downloadList:
fileUrl = getAbsoluteURL(baseUrl, download["src"])
if fileUrl is not None:
print(fileUrl)
urlretrieve(fileUrl, getDownloadPath(baseUrl, fileUrl, downloadDirectory))
