traitlets.config.application:Application._get_sys_argv

Extended Summary

argcomplete's strategy is to call the python script with no arguments, so len(sys.argv) == 1, and run until the ArgumentParser is constructed and determine what completions are available.

On the other hand, traitlet's subcommand-handling strategy is to check sys.argv[1] and see if it matches a subcommand, and if so then dynamically load the subcommand app and initialize it with sys.argv[1:].

This helper method helps to take the current tokens for argcomplete and pass them through as argv.