Re: --help option: sys.exit or return?

On 18 October 2004, Miguel A Figueroa-Villanneva said:
> When Optik calls sys.exit(), because it encounters --version, --help, or
> an error your interactive Python interpreter will exit.

Hmmm, good point.  I very rarely play with Optik in an interactive
session, so I've never been bitten by this.  But the interactive
interpreter is one of Python's best features, so I can see your point.

> Is there a better solution to this? For example, a way to 'exit' only if
> the script was run from outside the python interpreter (i.e. if __name__
> == "__main__") and only 'return' from the main function if it was run from
> the interpreter.

Nope, in Optik __name__ == "optik.option_parser" or similar.  And there
is *always* some namespace up the callstack where __name__ == __main__,
interactive session or not.  Offhand, I don't know of a good way to
detect interactive sessions.

In any version of Optik, you can do this:

  try:
      parser.parse_args(...)
  except SystemExit:
      print "caught SystemExit"

In Optik 1.5, help/version options always go via OptionParser.exit(), so
you can override that method if you like.

Both of these are a bit clumsy for interactive use, though.  Hmmmm.

        Greg
-- 
Greg Ward <[email protected]>                         http://www.gerg.ca/
Clarke's Law, redux:
Any sufficiently advanced technology is indistinguishable from a rigged demo.


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