I am running Ubuntu 13.10 and fish 2.1.0. I want to write myself a Python script to do some tasks from the command line. The script will require command line arguments.
You should create a fish autocomplete function for your script and source it or put it in ~/.config/fish/completions/myprog.fish folder.
source
~/.config/fish/completions/myprog.fish
reference: fish docs