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Groups > comp.lang.python > #52534
| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Subject | Re: many constructors in a class? |
| Date | 2013-08-14 18:40 -0400 |
| Organization | IISS Elusive Unicorn |
| References | <520b913f$0$13995$426a74cc@news.free.fr> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.589.1376520059.1251.python-list@python.org> (permalink) |
On 14 Aug 2013 14:16:31 GMT, climb65 <climb65@laposte.net> declaimed the
following:
>Hello,
>
>here is a small basic question :
>
>Is it possible to have more than one constructor (__init__ function) in a
>class? For instance, to create an object with 2 different ways? If my
>memory is good, I think that with C++ it is possible.
>
Well... Secret Python-Fu -- __init__() is NOT a constructor. The
constructor is __new__(); __init__() is just an initializer of whatever
__new__() creates.
Ignoring that detail... NO!
If the goal is to be able to "leave out" some parameters, that is
performed by setting default values for the missing parameters.
def __init__(self, these, are, mandatory, but=None, this=None,
is=None, optional=None):
self.these = these
self.are = are
self.mandatory = mandatory
if but is None:
self.but = these + are
else:
self.but = but
#etc.
--
Wulfraed Dennis Lee Bieber AF6VN
wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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many constructors in a class? climb65 <climb65@laposte.net> - 2013-08-14 14:16 +0000
Re: many constructors in a class? Phil Le Bienheureux <phil.le.bienheureux@gmail.com> - 2013-08-14 16:46 +0200
Re: many constructors in a class? duncan smith <buzzard@invalid.invalid> - 2013-08-14 16:07 +0100
Re: many constructors in a class? Beth McNany <beth.mcnany@gmail.com> - 2013-08-14 10:40 -0400
Re: many constructors in a class? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-08-14 18:40 -0400
Re: many constructors in a class? Steven D'Aprano <steve@pearwood.info> - 2013-08-15 07:23 +0000
Re: many constructors in a class? Fábio Santos <fabiosantosart@gmail.com> - 2013-08-15 11:09 +0100
Re: many constructors in a class? Roy Smith <roy@panix.com> - 2013-08-15 09:00 -0400
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