Kirt wrote: > I am a newbie and stuck over this for a week
that's unfortunate. > I have a code > ==================CODE============= > List=[['1', 'a', '6'], ['1', 'b', '6'], ['1', 'c', '6'], > ['1', 'd', '6'],['2', 'a','6'], ['2', 'b', '6'], > ['2', 'c', '6'], ['2', 'd', '6'], ['3', 'a', '6'], > ['3','b', '6'], ['4', 'a', '6'], ['4', 'b', '6']] > > > for x in List: > temp=[] > print x > for y in List: > if x[0]==y[0]: > print y[0],y[1] > temp.append(y) > for z in temp: > List.remove(z) > print 'rem', z the for loop uses an internal index to fetch items from the list you're looping over, so if you remove items from it, you'll end up skipping over items. this is hinted at in the tutorial: http://docs.python.org/tut/node6.html#SECTION006200000000000000000 and explained in further detail in the language reference: http://docs.python.org/ref/for.html http://pyref.infogami.com/for </F> -- http://mail.python.org/mailman/listinfo/python-list
