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| Date | Fri, 31 Oct 2014 13:20:36 -0400 |
| From | Dave Angel <davea@davea.name> |
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| Subject | Re: Classes |
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On 10/31/2014 12:31 PM, Seymore4Head wrote:
> In this class, we will follow the practice of accessing the contents
> of objects using methods known as getters and setters. While not
> required by Python, this practice encourages the user of the class to
> manipulates class objects solely via class methods. The advantage of
> following this practice is that the implementer of the class
> definition (often someone other than the user of the class) may
> restructure the organization of the data fields associated with the
> object while avoiding the need to rewrite code that uses the class.
>
Written by somebody who doesn't understand a fundamental point about
Python. It's just not true that the user would have to rewrite code if
the implementer change the members.
The Python way of writing getters and setters (if/when you get to that
stage of a Python class) is through the property decorator or its
equivalent.
class Pet():
def __init__(self, ....):
self.internal details set here
@property()
def age(self):
return some_complicated_expression
And the user of the class fetches this by using
mypet = Pet(....)
hisage = mypet.age
No stupid parentheses needed. When the class is first written, no work
is needed. When it's updated to multiply the internal age by 7, just
write the function, and decorate it to look like a regular attribute.
More complicated things can be done. But the point is that the user
should just get the age, by accessing the age attribute, and if the
implementation needs to change, it can change.
The time to make a class complicated, is when it needs to be. And the
user should not have to pay the price for "just in case."
--
DaveA
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Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-30 16:16 -0400
Re: Classes sohcahtoa82@gmail.com - 2014-10-30 13:33 -0700
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-30 17:00 -0400
Re: Classes Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-10-30 13:34 -0700
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-30 17:00 -0400
Re: Classes Larry Hudson <orgnut@yahoo.com> - 2014-10-30 14:28 -0700
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-30 17:34 -0400
Re: Classes sohcahtoa82@gmail.com - 2014-10-30 18:21 -0700
Re: Classes alister <alister.nospam.ware@ntlworld.com> - 2014-10-31 09:59 +0000
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 10:07 -0400
Re: Classes "ast" <nomail@invalid.com> - 2014-10-31 10:05 +0100
Re: Classes "ast" <nomail@invalid.com> - 2014-10-31 10:18 +0100
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-10-31 20:21 +1100
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 10:05 -0400
Re: Classes Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-31 08:47 -0600
Re: Classes Grant Edwards <invalid@invalid.invalid> - 2014-10-31 15:49 +0000
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 12:31 -0400
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 03:37 +1100
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 12:47 -0400
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 04:02 +1100
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 13:31 -0400
Re: Classes Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-31 12:39 -0500
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 13:57 -0400
Re: Classes Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-10-31 10:40 -0700
Re: Classes Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-11-01 11:17 +1300
Re: Classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-01 12:06 +1100
Re: Classes Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-01 00:12 -0600
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 17:32 +1100
Re: Classes Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-11-03 00:32 +1300
Re: Classes Dave Angel <davea@davea.name> - 2014-10-31 13:20 -0400
Re: Classes Marko Rauhamaa <marko@pacujo.net> - 2014-10-31 19:35 +0200
Re: Classes Grant Edwards <invalid@invalid.invalid> - 2014-10-31 17:40 +0000
Re: Classes Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-10-31 18:26 -0400
Re: Classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-01 12:09 +1100
Re: Classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-01 04:06 +1100
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 13:18 -0400
Re: Classes Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-10-31 10:43 -0700
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 14:18 -0400
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 14:42 -0400
Re: Classes Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-10-31 18:57 -0400
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 19:22 -0400
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 19:32 -0400
Re: Classes Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-01 12:00 -0400
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-11-01 12:42 -0400
Re: Classes Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-02 09:50 +0000
Re: Classes Tim Delaney <timothy.c.delaney@gmail.com> - 2014-11-02 21:32 +1100
Re: Classes Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-02 12:27 +0000
Re: Classes Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-02 11:31 -0500
Re: Classes Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-03 03:12 +0000
Re: Classes Dan Sommers <dan@tombstonezero.net> - 2014-11-03 06:29 +0000
Re: Classes Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-04 01:10 +0000
Re: Classes Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-11-04 18:30 +1300
Re: Classes Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-03 08:50 -0500
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-04 02:34 +1100
Re: Classes Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-03 07:47 -0700
Re: Classes Larry Hudson <orgnut@yahoo.com> - 2014-11-02 14:03 -0800
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 07:51 +1100
Re: Classes sohcahtoa82@gmail.com - 2014-10-31 14:24 -0700
Re: Classes Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-10-31 14:40 -0700
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 08:56 +1100
Re: Classes Chris Angelico <rosuav@gmail.com> - 2014-11-01 08:36 +1100
Re: Classes Grant Edwards <invalid@invalid.invalid> - 2014-10-31 17:43 +0000
Re: Classes Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-10-31 14:11 +0000
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 12:49 -0400
Re: Classes "ast" <nomail@invalid.com> - 2014-10-31 19:31 +0100
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 14:36 -0400
Re: Classes Joel Goldstick <joel.goldstick@gmail.com> - 2014-10-31 14:41 -0400
Re: Classes Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-31 14:56 -0400
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