novaBBS - comp.lang.python - Which more Pythonic

Which more Pythonic - self.__class__ or type(self)?

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Subject: Which more Pythonic - self.__class__ or type(self)?
Date: Thu, 2 Mar 2023 14:54:50 -0600
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by: Ian Pilcher - Thu, 2 Mar 2023 20:54 UTC

Re: Which more Pythonic - self.__class__ or type(self)?

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From: greg.ew...@canterbury.ac.nz (Greg Ewing)
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Subject: Re: Which more Pythonic - self.__class__ or type(self)?
Date: Fri, 3 Mar 2023 11:53:28 +1300
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by: Greg Ewing - Thu, 2 Mar 2023 22:53 UTC

Re: Which more Pythonic - self.__class__ or type(self)?

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From: lis...@tompassin.net (Thomas Passin)
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Subject: Re: Which more Pythonic - self.__class__ or type(self)?
Date: Thu, 2 Mar 2023 18:43:08 -0500
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by: Thomas Passin - Thu, 2 Mar 2023 23:43 UTC

RE: Which more Pythonic - self.__class__ or type(self)?

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by: - Fri, 3 Mar 2023 00:35 UTC

My understanding is that python created functions like type() and len() as a
general purpose way to get information and ALSO set up a protocol that
classes can follow by creating dunder methods. I think the most pythonic
things is to avoid directly calling the dunder methods with a few exceptions
that mainly happen when you are building or extending classes. I mean some
dunder methods are then called directly to avoid getting into infinite loops
that would be triggered.

And note in many cases, the protocol is more complex. Is a length built-in?
If not, can the object be iterated and you count the results? Calling the
function len() may get you more info as it can leverage such things. And it
means you can sometimes leave out some methods and your code still works.

Be warned that type() is a very special function in python and when called
with more arguments, does many relatively beautiful but unrelated things. It
has a special role in the class or type hierarchy. But used with a single
argument, it harmlessly return a result you want.

-----Original Message-----
From: Python-list <python-list-bounces+avi.e.gross=gmail.com@python.org> On
Behalf Of Thomas Passin
Sent: Thursday, March 2, 2023 6:43 PM
To: python-list@python.org
Subject: Re: Which more Pythonic - self.__class__ or type(self)?

On 3/2/2023 5:53 PM, Greg Ewing via Python-list wrote:
> On 3/03/23 9:54 am, Ian Pilcher wrote:
>> I haven't found
>> anything that talks about which form is considered to be more Pythonic
>> in those situations where there's no functional difference.
>
> In such cases I'd probably go for type(x), because it looks less
> ugly.
>
> x.__class__ *might* be slightly more efficient, as it avoids a
> global lookup and a function call. But as always, measurement
> would be required to be sure.

Except that we don't know if "efficiency" - whatever that might mean
here - matters at all.

--
https://mail.python.org/mailman/listinfo/python-list

Re: Which more Pythonic - self.__class__ or type(self)?

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Subject: Re: Which more Pythonic - self.__class__ or type(self)?
Date: 3 Mar 2023 14:40:11 GMT
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by: Stefan Ram - Fri, 3 Mar 2023 14:40 UTC

Ian Pilcher <arequipeno@gmail.com> writes:
>Seems like an FAQ, and I've found a few things on StackOverflow that
>discuss the technical differences in edge cases, but I haven't found
>anything that talks about which form is considered to be more Pythonic
>in those situations where there's no functional difference.

Here in USENET, we often use short noun phrases as subjects
and write any questions into the body of the message. If we
use questions in the subject, we repeat them in the body.

Some security guidelines recommend never to access attributes of
"None". For example, the World-Wide Web has:

|Attributes of None values should never be accessed.
"RSPEC-2259"

. Followers of this guideline would not use "None.__class__",
but could use "type( None )". Then, for consistency with the
"None" situation, they could prefer "type( None )" even in
other cases.

(But this guidelines does not seem to take into
consideration that in Python "None" has dunder
attributes which can be accessed without problems.)

Pause for storage relocation.

devel / comp.lang.python / Which more Pythonic - self.class or type(self)?

Subject	Author
Which more Pythonic - self.__class__ or type(self)?	Ian Pilcher
Re: Which more Pythonic - self.__class__ or type(self)?	Greg Ewing
Re: Which more Pythonic - self.__class__ or type(self)?	Thomas Passin
RE: Which more Pythonic - self.__class__ or type(self)?	<avi.e.gross
Re: Which more Pythonic - self.__class__ or type(self)?	Stefan Ram

Pause for storage relocation.

devel / comp.lang.python / Which more Pythonic - self.__class__ or type(self)?

devel / comp.lang.python / Which more Pythonic - self.class or type(self)?