从列表中下载文件，如果没有下载

从列表中下载文件，如果没有下载

这应该做的伎俩，虽然我假定

urls.txt

文件只包含的URL。没有

url:

前缀。

import osimport urllibDOWNLOADS_DIR = '/python-downloader/downloaded'# For every line in the filefor url in open('urls.txt'):    # Split on the rightmost / and take everything on the right side of that    name = url.rsplit('/', 1)[-1]    # Combine the name and the downloads directory to get the local filename    filename = os.path.join(DOWNLOADS_DIR, name)    # Download the file if it does not exist    if not os.path.isfile(filename):        urllib.urlretrieve(url, filename)