> From: Padmanaban Ganesan <padhu...@gmail.com> > Subject: Re: [Tutor] (no subject)
> Could any one explain me whats this in it .... abs(i)....??? >>> for i in range(-10,11): >>> print '*'*(11-abs(i)) I'll try to explain it: with the first line you are looping through all integer from i = -10 to 10 the idea is to use i as the number of * for each line. using print '*' * i will print * exactly i times. so one could write for i in range(-10,11): print '*'*i but this will not work for negative values of i, so we use abs(i) (i.e. the absolute value of i). Now for i in range(-10,11): print '*'*abs(i) will produce ********** ********* ******** ******* ****** ***** **** *** ** * * ** *** **** ***** ****** ******* ******** ********* ********** which is not quite what we want, and that's the reason of the 11-abs(i) part.: for i in range(-10,11): print '*' * (11-abs(i)) so, for example, when i=-10 (the first line) we want only 1 *, and in fact 11-abs(i) = 11-abs(-10) = 11-10 = 1, so we get print '*' * 1. when i = -9 the expression gives 2, and so on. with i = 0 we get 11 * and we start then going down as for i = 1 we have 10 *, for i=2 we have 9 * and so on until i=10 which gives 1 *. Hope my english was clear enough :( _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
