python: finding the active window without the script becoming the active one

Question

I need to get the file name of an opened PDF in acrobat. Since script doesn’t know the PDF path it needs to find the title of the active window.

I found this script on Obtain Active window using Python :

from win32gui import GetWindowText, GetForegroundWindow 

print GetWindowText(GetForegroundWindow())

It's working but since I'm starting the script as a keyboard shortcut, the active window changes: it switches from acrobat to python. The active window is not anymore the pdf opened in acrobat but the shortcut that launches the script.

So the script print "script.py", instead of the "my pdf.pdf-adobe acrobat"

Any idea how to solve this?