[Python] Can python get the screen shot of a specific window?

For example, I am running a java program. Can I use python to get the content(screenshot) of this java program? Not the full screen, just the java program.

I have seen this module, but it required a parameter of "where the program window is":

import pyscreenshot as ImageGrab

if __name__ == "__main__":
# part of the screen
im=ImageGrab.grab(bbox=(10,10,510,510)) # X1,Y1,X2,Y2
im.show()
#-#


But this may not be what I am seeking since it requires the bounding_box.

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