Proposal: add sys to __builtins__
steve at holdenweb.com
Fri Sep 2 04:09:40 CEST 2005
Rick Wotnaz wrote:
> Michael Hoffman <cam.ac.uk at mh391.invalid> wrote in
> news:df7jlu$1te$1 at gemini.csx.cam.ac.uk:
>>What would people think about adding sys to __builtins__ so that
>>"import sys" is no longer necessary? This is something I must
>>add to every script I write that's not a one-liner since they
>>have this idiom at the bottom:
>>if __name__ == "__main__":
>>Additionally, the necessity of "import sys" makes some
>>one-liners a little more unwieldy than they should be--it is
>>surely the module I am missing the most in one-liners. For
>>example, with this proposal, this inelegant one-liner:
>>$ python -c "import sys; print
>>could be replaced by:
>>$ python -c "print ''.join(sorted(sys.stdin.readlines()))"
>>Since sys is surely the most commonly used module (it is
>>imported in 108 of 188 Python 2.4 stdlib modules on my system,
>>and certainly more than any other module), I would hope few
>>people would be affected by a namespace collision.
>>Other languages (e.g. C#) always make their system namespace
>>available without needing a special import.
>>In short, given the wide use of sys, its unambiguous nature, and
>>the fact that it really is built-in already, although not
>>exposed as such, I think we would be better off if sys were
>>always allowed even without an import statement.
> +1 here. As far as I'm concerned, both os and sys could be special-
> cased that way. That said, I would guess the likelihood of that
> happening is 0.
I wonder if it would be worth special-casing the AttributeError
exception handling at the outermost lexical scope to try and import a
module with the troublesome name and then retrying the attribute access
if the import succeeded (possibly even from a path limited to the
That way none of the standard library modules would need to be imported
I can see that this would create problems as well as solving some, but
it would be nice not to have to import the standard library modules. I
don't personally find it a hardship, but some people do.
though-i-could-just-be-raving-ly y'rs - steve
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC http://www.holdenweb.com/
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