[issue3760] PEP 3121 --- PyType_Copy is missing

[Petr Viktorin]

Petr Viktorin  added the comment:

The need is covered by PEP 384's PyType_FromSpec (and later additions, the 
latest being PyType_FromModuleAndSpec).

Thanks for closing!

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[issue3760] PEP 3121 --- PyType_Copy is missing

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Zach Ware agreed on a coredev sprint discussion.

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resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue3760] PEP 3121 --- PyType_Copy is missing

[Terry J. Reedy]

Terry J. Reedy  added the comment:

12 years later there still is no PyType_Copy, at least not by that name, 
according to the doc index. So it is either not urgently needed or the need has 
been covered by other additions. I think that this should be closed as out of 
date and any new additions should be done in the light of the current situation.

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[issue3760] PEP 3121 --- PyType_Copy is missing

[Alexander Belopolsky]

Changes by Alexander Belopolsky alexander.belopol...@gmail.com:


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[issue3760] PEP 3121 --- PyType_Copy is missing

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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[issue3760] PEP 3121 --- PyType_Copy is missing

[Martin v. Löwis]

Martin v. Löwis [EMAIL PROTECTED] added the comment:

The intention is that different interpreters have distinct, separate
instances of the type objects. This is desirable in case of class
variables, and standard for Python-defined types. Clearly, 3.0 won't
provide that separation for many of the builtin types (and never may);
for out-of-core types, it is really the choice of the module designer.

I forgot to implement PyType_Copy; it is meant to create a new type
object which is a field-by-field copy. It's now too late to add it to
3.0; extension authors requiring it now should include it's source code
(which is currently not even written - contributions are welcome).

Reconsidering it: what should it do to the base types? 
 a) just incref tp_base and clone tp_bases, 
 b) offer an optional parameter to specify an alternative base object, 
 c) offer an optional parameter to specify an alternative bases tuple.

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[issue3760] PEP 3121 --- PyType_Copy is missing

[Paul Pogonyshev]

New submission from Paul Pogonyshev [EMAIL PROTECTED]:

PEP 3121 at python.org mentions PyType_Copy().  However, it doesn't seem
to be present in SVN version and there is no apparent replacement. 
Please clarify how types should be created for different module
instances --- if just sharing is fine, or should some copying (which
function?) be used.

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components: Interpreter Core
messages: 72362
nosy: _doublep
severity: normal
status: open
title: PEP 3121 --- PyType_Copy is missing
type: behavior
versions: Python 3.0

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[issue3760] PEP 3121 --- PyType_Copy is missing

[Benjamin Peterson]

Changes by Benjamin Peterson [EMAIL PROTECTED]:


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priority:  - high

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