In %appdata%\Notepad++\shortcuts.xml
add this command (using Shift+F1 because F1 alone now shows About):
<Command name="Get Python help" Ctrl="no" Alt="no" Shift="yes" Key="112">https://www.google.nl/#q=python+$(CURRENT_WORD)</Command>
More polished options are PyScripter and PyCharm (keymap F1 to View menu's "Quick Documentation"), but QBasic (and QB64) also show examples and related functions: