>-----Original Message----- >From: Tutor [mailto:tutor-bounces+crk=godblessthe...@python.org] On >Behalf Of Ben Finney >Sent: Sunday, November 09, 2014 8:25 PM >To: tutor@python.org >Subject: Re: [Tutor] don't understand iteration > >"Clayton Kirkwood" <c...@godblessthe.us> writes: > >> >-----Original Message----- >> >From: Tutor [mailto:tutor-bounces+crk=godblessthe...@python.org] On >> >Behalf Of Dave Angel > >(Clayton, does your mail client not present messages written by their >authors? The messages should not come to you “From:” the tutor list >itself. It's awkward to follow whom you're quoting.) > >> >(month, day, time, ap, offset) = blah.group( *list (range (1, 6))) >> > >> >Should do it. > >> Where did you find that one? > >Working through the Python Tutorial (actually doing the examples, and >working to understand them before moving on) teaches these and other >Python concepts <URL:https://docs.python.org/3/tutorial/>. > >> What does the '*' do/why? > >Learn about sequence unpacking in function parameters at the Tutorial ><URL:https://docs.python.org/3/tutorial/controlflow.html#tut-unpacking- >arguments>.
This seems to be the only relevant words: 4.7.4. Unpacking Argument Lists The reverse situation occurs when the arguments are already in a list or tuple but need to be unpacked for a function call requiring separate positional arguments. For instance, the built-in range() function expects separate start and stop arguments. If they are not available separately, write the function call with the *-operator to unpack the arguments out of a list or tuple: >>> list(range(3, 6)) # normal call with separate arguments [3, 4, 5] >>> args = [3, 6] >>> list(range(*args)) # call with arguments unpacked from a list [3, 4, 5] I fail to see the reference to '* list' except for possibly the '*-operator', for which there is no example or further guidance of this far too often used ability. And possibly later the reference to '*args' which appears to act as a wildcard/expander/replacement for the more exacting [3,6]. The only other places where I saw something like a '*list' was way off in PyObject and daughters suggesting a C char * or pointer. I'm sure I don't need to get into that just to find a reference to something so obvious as a '*list', something that I run across all of the time. I'm gettin' older and I can see out of one eye and not so good out of the other so I have to rotate the page 180 degrees to read the other half of the page and sometimes readin' upside down gives me difficulty and I miss '*'s every once in a while. Clayton PS, I'd still like to find a discussion and usage examples of this all too common '*list'. Thanks > >> And why the weird range thing? > >Learn about the ‘range’ built-in at the Python library reference ><URL:https://docs.python.org/3/library/functions.html#func-range>. > >-- > \ “I went to the museum where they had all the heads and arms | > `\ from the statues that are in all the other museums.” —Steven | >_o__) Wright | >Ben Finney > >_______________________________________________ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
