On Sun, Nov 2, 2008 at 12:41 PM, spir <[EMAIL PROTECTED]> wrote: > Sander Sweers a écrit : >>> Note that this creates a new list, replacing the one that was in >>> somelist. If you need to actually modify somelist in place (rare) then >>> use somelist[:] = [ x+1 for x in somelist ] >>> >>> which creates a new list, then replaces the *contents* of somelist >>> with the contents of the new list. >> >> In what (rare) situation would you use this? > > [post sent again -- seems not to have reached the list -- ??] > When you need to cleanup or normalize the objects held in a list. For > instance, > in text processing: > lines = text.splitlines() > lines = [line.strip() for line in lines] > <etc>
These are good examples of list comp but note that Sander was specifically asking when you might want to replace a list in place using the somelist[:] syntax. Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
