On Thu, 20 Aug 2009 18:41:34 +0000, Duncan Booth wrote: > David C Ullrich <dullr...@sprynet.com> wrote: > >> I just noticed that >> >> sequence[i:j:k] >> >> syntax in a post here. When did this happen? >> >> (I'm just curious whether it existed in 1.5.x or not. If so I'm stupid >> - otoh if it was introduced in 2.x I'm just slow...) >> >> > Googling for 'python extended slice' returns this as the first hit: > > http://www.python.org/doc/2.3.5/whatsnew/section-slices.html > >> 15 Extended Slices >> >> Ever since Python 1.4, the slicing syntax has supported an optional >> third ``step'' or ``stride'' argument. For example, these are all legal >> Python syntax: L[1:10:2], L[:-1:1], L[::-1]. This was added to Python >> at the request of the developers of Numerical Python, which uses the >> third argument extensively. However, Python's built-in list, tuple, and >> string sequence types have never supported this feature, raising a >> TypeError if you tried it. Michael Hudson contributed a patch to fix >> this shortcoming. > > So extended slices have existed since Python 1.4, but builtin types only > started to support them from 2.3.
Fine (I knew they existed in Numerical Python way back when...) -- http://mail.python.org/mailman/listinfo/python-list
