run a .py script with cmd line args

[r]

i have a python text editor program(script) that i would like to run
when a user clicks on .txt files.
how do i run my script from windows,
and send the filename to my script, so that my script can do:

if len(sys.argv) > 1:
    try:
         self.LoadFile(sys.argv[1])  # load text into editor
    except:
        pass

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