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Groups > comp.lang.python > #80064
| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Subject | Re: Classes |
| Date | 2014-10-31 18:26 -0400 |
| Organization | IISS Elusive Unicorn |
| References | (1 earlier) <545350c3$0$23449$426a74cc@news.free.fr> <bj575ahusmihp1fpm58gmcr2eg0g8k21o6@4ax.com> <mailman.15358.1414766892.18130.python-list@python.org> <m30b2n$gpu$1@reader2.panix.com> <iae75a5j9ec1qv8as3n5bipl2milv6kolm@4ax.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.15374.1414794369.18130.python-list@python.org> (permalink) |
On Fri, 31 Oct 2014 12:31:56 -0400, Seymore4Head
<Seymore4Head@Hotmail.invalid> declaimed the following:
>
>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.
In Python, the conversion of direct attributes into properties does
exactly that -- NO REWRITE of using code...
What you are being taught is NOT PYTHON.
-=-=-=-=-=-=-
def user():
mySomething = Something()
print mySomething.who
print id(mySomething), id(Something)
print mySomething.X
mySomething.X = 123
print mySomething.X
print "********"
class Something(object):
def __init__(self):
self.X = None
self.who = "I am the direct access version"
user() #invoke a user with first class definition
#now redefine the class with properties
class Something(object):
def __init__(self):
self._X = None
self.who = "I am the property version with getter/setter"
def _setX(self, vlu):
self._X = vlu
def _getX(self):
return self._X
X = property(_getX, _setX)
user() #invoke the SAME USER CODE but with class now using properties
-=-=-=-=-=-=-
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Wulfraed\Documents>cd "Python Progs"
C:\Users\Wulfraed\Documents\Python Progs>property.py
I am the direct access version
35663488 35817816
None
123
********
I am the property version with getter/setter
35663488 35818760
None
123
********
C:\Users\Wulfraed\Documents\Python Progs>
--
Wulfraed Dennis Lee Bieber AF6VN
wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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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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