Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #83198
| References | <60e62263-6cd1-48b9-acbc-f1a0b947b8c9@googlegroups.com> <CAO+9iGf=T6HoTb6+hh3r+uGAArs-E9R3eYX2VTRQdByhNnaJXQ@mail.gmail.com> |
|---|---|
| Date | 2015-01-04 22:48 +1100 |
| Subject | Re: Help with map python 2 |
| From | Alec Taylor <alec.taylor6@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.17369.1420372135.18130.python-list@python.org> (permalink) |
^To print the first 8. To print the first 100: map(lambda i: -i if i&1==1 else i, xrange(2, 102)) On Sun, Jan 4, 2015 at 10:47 PM, Alec Taylor <alec.taylor6@gmail.com> wrote: > map(lambda i: -i if i&1==1 else i, xrange(2, 10)) > > On Sun, Jan 4, 2015 at 10:34 PM, flebber <flebber.crue@gmail.com> wrote: >> In repsonse to this question: Write a program that prints the first 100 members of the sequence 2, -3, 4, -5, 6, -7, 8. >> >> This is my solution it works but ugly. >> >> series = range(2,100) >> # answer = [(x,(y* -1)) for x, y in series[::2]] >> # print(answer) >> answer = [] >> for item in series: >> if item % 2 != 0: >> answer.append(item * -1) >> else: >> answer.append(item) >> >> print(answer) >> >> I know I should be better off doing this with map but cannot get it to work. I understand also that map returns a generator so this solution should only working in python2(correct me please if I am wrong). >> >> In [6]: map? >> Type: builtin_function_or_method >> String Form:<built-in function map> >> Namespace: Python builtin >> Docstring: >> map(function, sequence[, sequence, ...]) -> list >> >> Just getting something wrong >> list(map((lambda x: x * -1 if (x%2 != 0)), series)) >> -- >> https://mail.python.org/mailman/listinfo/python-list
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Help with map python 2 flebber <flebber.crue@gmail.com> - 2015-01-04 03:34 -0800
Re: Help with map python 2 Chris Angelico <rosuav@gmail.com> - 2015-01-04 22:47 +1100
Re: Help with map python 2 Alec Taylor <alec.taylor6@gmail.com> - 2015-01-04 22:47 +1100
Re: Help with map python 2 Alec Taylor <alec.taylor6@gmail.com> - 2015-01-04 22:48 +1100
Re: Help with map python 2 Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-04 14:08 +0200
Re: Help with map python 2 flebber <flebber.crue@gmail.com> - 2015-01-05 03:33 -0800
Re: Help with map python 2 Terry Reedy <tjreedy@udel.edu> - 2015-01-05 18:28 -0500
Re: Help with map python 2 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-06 12:30 +1100
Re: Help with map python 2 Peter Otten <__peter__@web.de> - 2015-01-04 17:33 +0100
Re: Help with map python 2 Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-01-04 12:32 -0500
Re: Help with map python 2 Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-01-04 12:41 -0500
Re: Help with map python 2 Dan Stromberg <drsalists@gmail.com> - 2015-01-04 10:06 -0800
Re: Help with map python 2 Terry Reedy <tjreedy@udel.edu> - 2015-01-04 16:13 -0500
Re: Help with map python 2 flebber <flebber.crue@gmail.com> - 2015-01-05 03:37 -0800
Re: Help with map python 2 Sayth Renshaw <flebber.crue@gmail.com> - 2015-01-04 21:22 +0000
csiph-web