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devel / comp.lang.python / Re: Using __new__ (Posting On Python-List Prohibited)

SubjectAuthor
* Using __new__Jonathan Gossage
`* Re: Using __new__Stefan Ram
 `- Re: Using __new__ (Posting On Python-List Prohibited)Lawrence D'Oliveiro

1
Using __new__

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From: jgossage@gmail.com (Jonathan Gossage)
Newsgroups: comp.lang.python
Subject: Using __new__
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 by: Jonathan Gossage - Sat, 17 Feb 2024 22:35 UTC

I am attempting to use the __new__ method in the following code:
class SingletonExample(object):

_instance = None

def __new__(cls, **kwargs):
if cls._instance is None:
cls._instance = super().__new__(cls, **kwargs)
return cls._instance

def __init__(self, **kwargs) -> None:
our_attributes = ('h', 'x')
if kwargs is not None:
for k, v in kwargs.items():
if k in our_attributes:
setattr(self, k, v)

a = SingletonExample(h=1)

and I get the following result:

(PRV) jonathan@jfgdev:/PR$ python -m Library.Testing.test2
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/mnt/ProgrammingRenaissance/Library/Testing/test2.py", line 16, in
<module>
a = SingletonExample(h=1)
^^^^^^^^^^^^^^^^^^^^^
File "/mnt/ProgrammingRenaissance/Library/Testing/test2.py", line 6, in
__new__
cls._instance = super().__new__(cls, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: object.__new__() takes exactly one argument (the type to
instantiate)

I am quite puzzled as it looks as if this code will not work if the
super-class is 'object'. Any suggestions on how to proceed?

--
Jonathan Gossage

Re: Using __new__

<new-20240217234535@ram.dialup.fu-berlin.de>

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: Using __new__
Date: 17 Feb 2024 22:51:29 GMT
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 by: Stefan Ram - Sat, 17 Feb 2024 22:51 UTC

Jonathan Gossage <jgossage@gmail.com> writes:
>I am attempting to use the __new__ method in the following code:
>class SingletonExample(object):

Above, you specify that the superclass is "object".

>super().__new__(cls, **kwargs)

Now, since you know the superclass to be "object",
why can't you just write "super().__new__( cls )"?

Re: Using __new__ (Posting On Python-List Prohibited)

<uqridt$lp2s$2@dont-email.me>

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From: ldo@nz.invalid (Lawrence D'Oliveiro)
Newsgroups: comp.lang.python
Subject: Re: Using __new__ (Posting On Python-List Prohibited)
Date: Sun, 18 Feb 2024 00:19:09 -0000 (UTC)
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 by: Lawrence D'Oliv - Sun, 18 Feb 2024 00:19 UTC

On 17 Feb 2024 22:51:29 GMT, Stefan Ram wrote:

> Above, you specify that the superclass is "object".

Which is redundant, anyway.

devel / comp.lang.python / Re: Using __new__ (Posting On Python-List Prohibited)

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