python - 用 Python 下载延时摄影图像

Question

我想在网站上下载每 15 秒刷新一次的 JPG 图像，以获得一组文件，这些文件可以稍后由视频延时程序组装。我正在使用 Python ver.3，但我对提供的大量建议、文件的打开和关闭感到不知所措。没有一个简单的命令可以在不打开文件的情况下获取文件，并将其存储在其名称中的索引中吗？

Answer 1

import urllib.error
import urllib.request
import time

imageURL = 'http://YOUR-WEB-SITE.com/imageName.jpg'

directoryForImages = '/where/you/want/to/store/image/'
imageBaseName = 'basename'
extension = '.jpg'

maxLoops = 100

for imageNumber in range(0, maxLoops):
    try:
        # Open a file object for the webpage where you will get the image
        f = urllib.request.urlopen(imageURL)
        # Open the local file where you will store the image
        imageF = open('{0}{1}{2}{3}'.format(directoryForImages, imageBaseName, imageNumber, extension), 'wb')
        # Write the image to the local file
        imageF.write(f.read())

        # Clean up
        imageF.close()
        f.close()
    except urllib.error.HTTPError:   # The 'except' block executes if an HTTPError is thrown by the try block, then the program continues as usual.
        print "Image fetch failed.  Waiting another 15 seconds..."

    time.sleep(15)