Apparently Travis Oliphant of numpy would like this as well... http://technicaldiscovery.blogspot.com/2011/06/python-proposal-enhancements-i-wish-i.html
On Wednesday, February 13, 2013 2:00:15 PM UTC-5, steph...@gmail.com wrote: > Hello, > > > > Would it be feasible to modify the Python grammar to allow ':' to generate > slice objects everywhere rather than just indexers and top-level tuples of > indexers? > > > > Right now in Py2.7, Py3.3: > > "obj[:,2]" yields "obj[slice(None),2]" > > but > > "obj[(:,1),2]" is an error, instead of "obj[(slice(None), 1), 2]" > > > > Also, more generally, you could imagine this working in (almost?) any > expression without ambiguity: > > "a = (1:2)" could yield "a = slice(1,2)" > > > > See motivating discussion for this at: > > https://github.com/pydata/pandas/issues/2866 > > > > There might not be very many use cases for this currently outside of pandas, > but apparently the grammar was already modified to allow '...' outside > indexers and there's probably even fewer valid use cases for that: > > "e = ..." yields "e = Ellipsis" > > > > Would there be any downside to changing the handling of ':' as well? It might > even make the grammar simpler, in some ways, since indexers won't have to be > treated specially. > > > > Let me know if you have any thoughts. > > > > Thanks! > > Stephen -- http://mail.python.org/mailman/listinfo/python-list
