Can't range go from larger to smaller?
"Diez B. Roggisch" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Dongsheng Ruan wrote: > >> I want to turn an Array into a heap, but my code just doesn't work: no >> change after execution. >> >> A=[3,5,4,9,6,7] >> m=len(A)-1 >> >> >> >> for i in range(m,1): >> t=(i-1)/2 >> if A[i]>A[t]: >> A[i],A[t]=A[t],A[i] > > First of all, there is the module heapq that will just do it. > > And then you seem to misunderstand how the range-function works. range(m, > 1) > will always be the empty list. See > > pydoc range > > for how it operates. > > Overall, your code is very unpythonic, to say the least. I suggest you > start > reading the python tutorial first: > > http://docs.python.org/tut/ > > Especially the looping techniques section: > > http://docs.python.org/tut/node7.html#SECTION007600000000000000000 > > Diez -- http://mail.python.org/mailman/listinfo/python-list
