[Python-Dev] PEP397 no command line options to python? (original) (raw)
Mark Hammond skippy.hammond at gmail.com
Mon Oct 24 02:00:45 CEST 2011
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On 24/10/2011 10:36 AM, Nick Coghlan wrote:
On Mon, Oct 24, 2011 at 8:15 AM, Mark Hammond<skippy.hammond at 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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