how include a python code in notpad++ plugin

[akbarza]

hi
I wanted to draw a line in notpad++, so I searched Google for it.
in address: https://sourceforge.net/p/notepad-plus/d.../a0308d54/
has been written that

Or you could install the python script plug-in and use this bit of python

:
and said that the below code must be used:

#####
## Draw a dashed line
#####

# First we'll start an undo action, then Ctrl-Z will undo the actions of the whole script
editor.beginUndoAction()

dash='-'
width=80
print dash*width

## Finished.
# End the undo action, so Ctrl-Z will undo the above two actions
editor.endUndoAction()

# Turn the undo recorder back on.
editor.setUndoCollection(1)

I have Python script in notepad++ on my PC(it is in the plugin tab in the notepad++). how can I use the above code in notpad++?
thanks