using python to visit web sites and print the web sites image to files

[Michael Bentley]

>
> I wonder whether python can be used to simulate a real user to do the
> following:
> 1) open a web site in a browser;
> 2) printscreen, so to copy the current active window image to
> clipboard;
> 3) save the image file to a real file
>
> Any pointer will be apprieciated!

Which OS?