On 24/10/2011 10:36 AM, Nick Coghlan wrote:
On Mon, Oct 24, 2011 at 8:15 AM, Mark Hammond<skippy.hamm...@gmail.com> wrote:
How about abusing the existing flags for this purpose - eg:
% py -3?
% py -2.7?
What does using the magic symbol offer over an explicit separate flag?
* The "magic" symbol is somewhat self-documenting - it implies a
question. Using --which adds another special case that people would
need to understand isn't passed to Python. IOW, I like that there is
only 1 special option and that one special option can be expressed in
the form of a question.
* Simplicity - does "py -2.3 --which" work the same as "py --which
-2.3"? If not, that's not at all intuitive. If so, it adds complexity
to the launcher and the PEP text.
* Extensibility - While I've resisted, I predict that due to popular
demand, we will wind up supporting additional arguments which are passed
directly to Python (eg, "py -2.3 -W scriptName"). If we did, how would
we treat --which when it is specified with additional options?
So to turn the question back around - why introduce a new special option
when the existing single special option can be leveraged? Are we
opening the door to further special options?
I guess the key downside to this suggestion is that it doesn't allow you
ask where the default Python is without using "-2?" (or maybe just -?)
Mark
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