<[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > I have a list y > >>>y > ['20001201', 'ARRO', '04276410', '18.500', '19.500', '18.500', > '19.500', '224'] > > from which I want to extract only the 2nd and 4th item by partially > unpacking the list. So I tried > >>>a,b = y[2,4] > Traceback (most recent call last): > File "<interactive input>", line 1, in ? > TypeError: list indices must be integers > > Out of curiosity, I tried > >>>a,b = y[2:4] > >>>a > '04276410' > >>> b > '18.500' > > Why does this work (to a point - it gives me items 2 and 3, not 2 and > 4 as I require) and not my first attempt? What is the right syntax to > use when partially upacking a sequence? > > Thanks in advance > > Thomas Philips >
a,b = y[2],y[4] or a,b = y[2:5:2] or a,b = ( y[i] for i in (2,4) ) -- Paul -- http://mail.python.org/mailman/listinfo/python-list
