On Sun, Sep 25, 2011 at 3:31 PM, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote:>> If you look again at the code I used, I did. I just did it inside the list> comp. You did, but you created a Fraction from a float; my version used Fraction(21,10) instead of (effectively) Fraction(2.1). My description was a little sloppy, but what I meant was to use Fraction for the actual arguments to the "function" that this is implementing. > Something looks a tad suspicious here... the two list comps are identical, > but give completely different results, even though you don't re-assign > start and stop between calls. You're not editing your results are you? > <wink>
Whooops! I had a whole lot of other commands in the scrollback (displaying intermediate results and such), and elided the rather crucial reassignment of parameters along with them! Fortunately, thanks to my reiplophobia, I still have the original session up in IDLE. This is even the most recent thing in it. >>> sys.version '3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)]' >>> from fractions import Fraction as F >>> start,stop,n = F(0),F(21,10),7 >>> [float(start+i*(stop-start)/n) for i in range(n+1)] [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1] >>> start, stop, n = F(-1), F(11,10), 7 >>> [float(start+i*(stop-start)/n) for i in range(n+1)] [-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1] There, now it's honest. Sorry about that!! ChrisA -- http://mail.python.org/mailman/listinfo/python-list
