How to save an image locally using Python whose URL address I already know?

问题：

I know the URL of an image on Internet.我知道 Internet 上图像的 URL。

eg http://www.digimouth.com/news/media/2011/09/google-logo.jpg , which contains the logo of Google.例如http://www.digimouth.com/news/media/2011/09/google-logo.jpg ，其中包含 Google 的徽标。

Now, how can I download this image using Python without actually opening the URL in a browser and saving the file manually.现在，如何使用 Python 下载此图像，而无需实际在浏览器中打开 URL 并手动保存文件。

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解决方案：

参考一： https://en.stackoom.com/question/Yleq
参考二： https://stackoom.com/question/Yleq