Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #39847

Re: Python Newbie

References (15 earlier) <mailman.2454.1361748026.2939.python-list@python.org> <2e9471ad-8320-4f7f-80ba-cd5a7f8f013d@googlegroups.com> <mailman.2461.1361749985.2939.python-list@python.org> <da0ec7a1-decd-4cfb-9a0b-5722879f5864@googlegroups.com> <CAHVvXxT12Vz7HaPLjwXtGAxWWWULyDNTb28KCQ9Y78S9R4HKsA@mail.gmail.com>
Date 2013-02-25 12:24 +1100
Subject Re: Python Newbie
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.2471.1361755486.2939.python-list@python.org> (permalink)

Show all headers | View raw

On Mon, Feb 25, 2013 at 11:45 AM, Oscar Benjamin
<oscar.j.benjamin@gmail.com> wrote:
> On 25 February 2013 00:08,  <piterrr.dolinski@gmail.com> wrote:
> Chris Angelico wrote:
>>> For example (I believe it's already been mentioned) "declaring" intX with some integer value does *nothing* to maintain
>>>
>>> X as an integer:
>>>
>>> --> intX = 32
>>>
>>> --> intX = intX / 3.0
>>>
>>> --> intX
>>>
>>> 10.6666666666
>>>
>>
>> Yes I did see that it is possible to redefine the type of a variable. But I don't think I would ever do this intentionally; need to be really careful with Python.

> The trickier cases are ones where two types are very similar and can
> be used similarly in most, but not all, situations. An example of this
> would be the one that Chris has highlighted where an object that you
> expected to be an int is actually a float. I find that I need to be
> careful when using division on quantities that I expected to be
> integers (true in all languages) and careful about the notation used
> in a numeric literal. Once you get used to it, you will find it easy
> to see that the '.0' that Chris appended was deliberate in order to
> control the type of the resulting object.

Once again, Ethan gets the short end of the citations stick...
'twarn't me wrote that, he did. Not that it's at all contrary to my
views, and I might well have said it if he hadn't, but credit should
go his direction :)

Note though that in Python 3, you don't need the explicit .0 to force
it to float (and __future__ can bring that to Python 2 too). 32/3 ->
10.66666, int/int->float.

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Python Newbie Piterrr <piterrr.dolinski@gmail.com> - 2013-02-21 13:26 -0800
  Re: Python Newbie Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-21 14:54 -0700
  Re: Python Newbie MRAB <python@mrabarnett.plus.com> - 2013-02-21 21:58 +0000
  Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-22 08:59 +1100
  Re: Python Newbie Peter Pearson <ppearson@nowhere.invalid> - 2013-02-21 22:03 +0000
  Re: Python Newbie Dave Angel <davea@davea.name> - 2013-02-21 17:22 -0500
  Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-21 14:40 -0800
    Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-22 10:21 +1100
      Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-21 15:34 -0800
        Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-21 23:48 +0000
        Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-22 11:32 +1100
        Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 11:58 -0700
      Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-21 15:34 -0800
    Re: Python Newbie Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-21 23:27 +0000
    Re: Python Newbie Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-21 16:55 -0700
    Re: Python Newbie rusi <rustompmody@gmail.com> - 2013-02-21 22:57 -0800
    Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-22 10:26 +0000
      Re: Python Newbie Steve Simmons <square.steve@gmail.com> - 2013-02-22 12:05 +0100
      Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-22 22:23 +1100
    Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 16:04 -0700
    Re: Python Newbie Vito De Tullio <vito.detullio@gmail.com> - 2013-02-24 09:23 +0100
    Re: Python Newbie "J.R." <groups_jr-1@yahoo.com.br> - 2013-02-24 23:02 -0300
      Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 21:03 -0500
        Re: Python Newbie "J.R." <groups_jr-1@yahoo.com.br> - 2013-02-24 23:35 -0300
        Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 13:31 +1100
  Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-21 19:35 -0500
  Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-21 23:50 -0500
    Re: Python Newbie Rui Maciel <rui.maciel@gmail.com> - 2013-02-22 11:58 +0000
      Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-22 23:12 +1100
        Re: Python Newbie Rui Maciel <rui.maciel@gmail.com> - 2013-02-22 13:50 +0000
          Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 01:05 +1100
            Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-23 00:03 +0000
              Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 11:21 +1100
          Re: Python Newbie Duncan Booth <duncan.booth@invalid.invalid> - 2013-02-22 14:26 +0000
            Re: Python Newbie Steve Simmons <square.steve@gmail.com> - 2013-02-22 15:45 +0100
              Re: Python Newbie Duncan Booth <duncan.booth@invalid.invalid> - 2013-02-22 15:02 +0000
            Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 02:06 +1100
              Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-22 13:37 -0800
                Re: Python Newbie Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-22 22:08 +0000
                Re: Python Newbie Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-22 15:45 -0700
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-22 15:38 -0800
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 11:17 +1100
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-23 13:29 -0500
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-24 08:38 +1100
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 15:52 -0700
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-24 10:18 +1100
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-23 15:46 -0800
                Re: Python Newbie Larry Hudson <orgnut@yahoo.com> - 2013-02-23 20:20 -0800
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-24 14:34 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 07:46 -0800
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 02:52 +1100
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 11:22 -0500
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-24 17:44 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 11:29 -0800
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-24 21:35 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 14:43 -0800
                Re: Python Newbie Joel Goldstick <joel.goldstick@gmail.com> - 2013-02-24 18:05 -0500
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-24 23:13 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 14:43 -0800
                Re: Python Newbie Larry Hudson <orgnut@yahoo.com> - 2013-02-26 00:32 -0800
                Re: Python Newbie rurpy@yahoo.com - 2013-02-26 10:23 -0800
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-26 10:59 -0800
                Re: Python Newbie rurpy@yahoo.com - 2013-02-26 13:30 -0800
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-24 18:31 -0700
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 09:08 +1100
                Re: Python Newbie Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-24 23:18 +0000
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-24 22:51 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 15:38 -0800
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 10:45 +1100
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-24 15:53 -0800
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 16:08 -0800
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-25 00:28 +0000
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-25 00:38 +0000
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-24 16:33 -0800
                Re: Python Newbie Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-25 00:45 +0000
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 19:50 -0500
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-25 01:04 +0000
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 12:27 +1100
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-24 18:42 -0700
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 12:24 +1100
                Re: Python Newbie Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-25 01:44 +0000
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 12:53 +1100
                Re: Python Newbie MRAB <python@mrabarnett.plus.com> - 2013-02-25 02:23 +0000
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-24 18:59 -0800
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 16:08 -0800
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 19:42 -0500
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 15:38 -0800
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-24 23:21 +0000
                Re: Python Newbie Dave Angel <davea@davea.name> - 2013-02-24 17:47 -0500
                Re: Python Newbie Serhiy Storchaka <storchaka@gmail.com> - 2013-02-25 14:40 +0200
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 07:46 -0800
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 22:23 -0700
                Re: Python Newbie MRAB <python@mrabarnett.plus.com> - 2013-02-24 00:11 +0000
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-24 12:37 -0500
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-24 10:56 -0700
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 13:07 -0500
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-24 21:01 -0500
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-22 15:38 -0800
                Re: Python Newbie Terry Reedy <tjreedy@udel.edu> - 2013-02-22 20:04 -0500
                Re: Python Newbie rurpy@yahoo.com - 2013-02-22 18:48 -0800
                Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-22 20:47 -0500
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-23 02:02 +0000
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 13:18 +1100
                Re: Python Newbie Grant Edwards <invalid@invalid.invalid> - 2013-02-24 18:19 +0000
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 07:25 +1100
                Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-22 21:40 -0500
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-23 13:48 +1100
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-23 02:59 +0000
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-23 13:34 -0500
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-24 08:40 +1100
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-24 12:41 -0500
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-23 04:13 +0000
                Re: Python Newbie Serhiy Storchaka <storchaka@gmail.com> - 2013-02-23 11:48 +0200
                Re: Python Newbie Rui Maciel <rui.maciel@gmail.com> - 2013-02-23 12:30 +0000
                Re: Python Newbie Steve Simmons <square.steve@gmail.com> - 2013-02-23 16:43 +0100
                Re: Python Newbie jmfauth <wxjmfauth@gmail.com> - 2013-02-23 10:44 -0800
                Re: Python Newbie Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-23 12:13 -0700
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-23 11:08 -0800
                Re: Python Newbie jmfauth <wxjmfauth@gmail.com> - 2013-02-23 12:53 -0800
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-24 08:48 +1100
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-24 00:02 +0000
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 12:16 -0700
                Re: Python Newbie Matej Cepl <mcepl@redhat.com> - 2013-02-24 00:06 +0100
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-24 02:51 +1100
                Re: Python Newbie Matej Cepl <mcepl@redhat.com> - 2013-02-24 00:04 +0100
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-23 08:32 -0800
                Re: Python Newbie Steve Simmons <square.steve@gmail.com> - 2013-02-23 18:39 +0100
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 12:19 -0700
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-24 17:11 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 11:40 -0800
                Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-24 15:06 -0500
                Re: Python Newbie "Michael Ross" <gmx@ross.cx> - 2013-02-24 21:33 +0100
                Re: Python Newbie MRAB <python@mrabarnett.plus.com> - 2013-02-24 20:34 +0000
                Re: Python Newbie Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-24 20:41 +0000
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-24 12:34 -0800
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 07:42 +1100
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 15:48 -0500
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-24 21:58 +0000
                Re: Python Newbie Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-24 21:08 -0500
                Re: Python Newbie Joshua Landau <joshua.landau.ws@gmail.com> - 2013-02-25 02:59 +0000
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 07:47 +1100
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 07:58 +1100
                Re: Python Newbie Roy Smith <roy@panix.com> - 2013-02-24 16:08 -0500
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 08:44 +1100
                Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-24 17:40 -0500
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-25 01:11 +0000
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-25 00:42 +0000
                Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-24 18:34 -0700
                Re: Python Newbie Ethan Furman <ethan@stoneleaf.us> - 2013-02-24 14:33 -0800
                Re: Python Newbie Albert Hopkins <marduk@letterboxes.org> - 2013-02-24 18:32 -0500
                Re: Python Newbie Chris Angelico <rosuav@gmail.com> - 2013-02-25 10:44 +1100
                Re: Python Newbie Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-25 01:06 +0000
                Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-24 11:40 -0800
              Re: Python Newbie piterrr.dolinski@gmail.com - 2013-02-22 13:37 -0800
      Re: Python Newbie Mitya Sirenef <msirenef@lightbird.net> - 2013-02-22 20:05 -0500
  Re: Python Newbie Gene Heskett <gheskett@wdtv.com> - 2013-02-23 12:32 -0500
  Re: Python Newbie Steve Simmons <square.steve@gmail.com> - 2013-02-23 19:10 +0100
  Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 11:40 -0700
  Re: Python Newbie Michael Torrie <torriem@gmail.com> - 2013-02-23 12:15 -0700
  Re: Python Newbie Gene Heskett <gheskett@wdtv.com> - 2013-02-23 17:49 -0500
  Re: Python Newbie Nick Mellor <thebalancepro@gmail.com> - 2013-02-25 19:37 -0800

csiph-web