On Jan 18, 1:56 am, Terry Reedy <tjre...@udel.edu> wrote: > On 1/17/2010 5:37 PM, samwyse wrote: > > > > > > > Consider this a wish list. I know I'm unlikely to get any of these in > > time for for my birthday, but still I felt the need to toss it out and > > see what happens. > > > Lately, I've slinging around a lot of lists, and there are some simple > > things I'd like to do that just aren't there. > > > s.count(x[, cmp[, key]]) > > - return number of i‘s for which s[i] == x. 'cmp' specifies a custom > > comparison function of two arguments, as in '.sort'. 'key' specifies > > a custom key extraction function of one argument. > > s.index(x[, i[, j[, cmp[, key]]]]) > > - return smallest k such that s[k] == x and i<= k< j. 'cmp' and > > 'key' are as above. > > s.rindex(x[, i[, j[, cmp[, key]]]]) > > - return largest k such that s[k] == x and i<= k< j. 'cmp' and > > 'key' are as above. > > > There are two overlapping proposals here. One is to add the .rindex > > method, which strings already have. The other is to extend the > > optional arguments of .sort to all other methods that test for item > > equality. > > > One last thing, the Python 2.6.2 spec says .count and .index only > > apply to mutable sequence types. I see no reason why they > > (and .rindex) couldn't also apply to immutable sequences (tuples, in > > particular). > > In 3.x, tuple does have those methods, even though the doc is not clear > (unless fixed by now).
That's good to hear. Perhaps I should have tried them directyly, but my 3.1 docs still echo the 2.x docs, which only show them for immutable sequences. -- http://mail.python.org/mailman/listinfo/python-list