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Miss Islington (bot) 2ce8af3cbc
bpo-42073: allow classmethod to wrap other classmethod-like descriptors (GH-27115) (GH-27162) 
Patch by Erik Welch.

bpo-19072 (GH-8405) allows `classmethod` to wrap other descriptors, but this does
not work when the wrapped descriptor mimics classmethod.  The current PR fixes
this.

In Python 3.8 and before, one could create a callable descriptor such that this
works as expected (see Lib/test/test_decorators.py for examples):
```python
class A:
    @myclassmethod
    def f1(cls):
        return cls

    @classmethod
    @myclassmethod
    def f2(cls):
        return cls
```
In Python 3.8 and before, `A.f2()` return `A`. Currently in Python 3.9, it
returns `type(A)`.  This PR make `A.f2()` return `A` again.

As of GH-8405, classmethod calls `obj.__get__(type)` if `obj` has `__get__`.
This allows one to chain `@classmethod` and `@property` together.  When
using classmethod-like descriptors, it's the second argument to `__get__`--the
owner or the type--that is important, but this argument is currently missing.
Since it is None, the "owner" argument is assumed to be the type of the first
argument, which, in this case, is wrong (we want `A`, not `type(A)`).

This PR updates classmethod to call `obj.__get__(type, type)` if `obj` has
`__get__`.

Co-authored-by: Erik Welch <erik.n.welch@gmail.com>
(cherry picked from commit b83861f026)
2021-07-15 15:42:11 +02:00
..
clinic bpo-42431: Fix outdated bytes comments (GH-23458) 2020-12-03 12:46:16 +02:00
stringlib bpo-43179: Generalise alignment for optimised string routines (GH-24624) 2021-03-31 12:12:39 +02:00
abstract.c bpo-31861: Add aiter and anext to builtins (#23847) 2021-03-23 15:47:21 -07:00
accu.c bpo-35081: Move accu.h to Include/internal/pycore_accu.h (GH-10271) 2018-11-01 02:30:36 +01:00
boolobject.c bpo-41870: Avoid the test when nargs=0 (GH-22462) 2020-10-01 13:50:40 +09:00
bytearrayobject.c bpo-42128: Structural Pattern Matching (PEP 634) (GH-22917) 2021-02-26 14:51:55 -08:00
bytes_methods.c bpo-43179: Generalise alignment for optimised string routines (GH-24624) 2021-03-31 12:12:39 +02:00
bytesobject.c bpo-42128: Structural Pattern Matching (PEP 634) (GH-22917) 2021-02-26 14:51:55 -08:00
call.c bpo-42990: Further refactoring of PyEval_ functions. (GH-24368) 2021-02-01 10:42:03 +00:00
capsule.c bpo-42519: Replace PyObject_MALLOC() with PyObject_Malloc() (GH-23587) 2020-12-01 10:37:39 +01:00
cellobject.c bpo-40268: Remove unused pycore_pymem.h includes (GH-19531) 2020-04-15 02:57:50 +02:00
classobject.c bpo-40268: Remove unused pycore_pymem.h includes (GH-19531) 2020-04-15 02:57:50 +02:00
codeobject.c [3.10] Add more const modifiers. (GH-26691). (GH-26692) 2021-06-12 18:44:32 +01:00
complexobject.c bpo-43475: Fix worst case collision behavior for NaN instances (GH-25493) 2021-04-22 08:34:57 -07:00
descrobject.c bpo-43977: Use tp_flags for collection matching (GH-25723) 2021-04-30 09:50:28 +01:00
dict-common.h bpo-33312: Fix clang ubsan out of bounds warnings in dict. (GH-6537) 2018-04-19 22:41:19 -07:00
dictnotes.txt Issue #15055: update dictnotes.txt. Patch by Mark Shannon. 2012-06-24 21:03:45 +02:00
dictobject.c bpo-44114: Remove redundant cast. (GH-26098) 2021-05-13 14:07:31 -07:00
enumobject.c bpo-42536: GC track recycled tuples (GH-23623) 2020-12-04 19:45:57 -08:00
exceptions.c bpo-43914: Highlight invalid ranges in SyntaxErrors (#25525) 2021-04-23 14:27:05 +01:00
fileobject.c bpo-43916: PyStdPrinter_Type uses Py_TPFLAGS_DISALLOW_INSTANTIATION (GH-25749) 2021-04-30 14:56:27 +02:00
floatobject.c bpo-43475: Fix worst case collision behavior for NaN instances (GH-25493) 2021-04-22 08:34:57 -07:00
frameobject.c bpo-42800: Rename AUDIT_READ to PY_AUDIT_READ (GH-25736) 2021-04-30 01:08:55 +01:00
funcobject.c bpo-42073: allow classmethod to wrap other classmethod-like descriptors (GH-27115) (GH-27162) 2021-07-15 15:42:11 +02:00
genericaliasobject.c bpo-44562: Use PyType_GenericAlloc in Py_GenericAlias (GH-27021) 2021-07-05 04:33:53 -07:00
genobject.c bpo-42800: Rename AUDIT_READ to PY_AUDIT_READ (GH-25736) 2021-04-30 01:08:55 +01:00
interpreteridobject.c bpo-43962: Fix _PyInterpreterState_IDIncref() (GH-25683) 2021-04-28 13:40:44 +02:00
iterobject.c bpo-43751: Fix anext() bug where it erroneously returned None (GH-25238) 2021-04-11 05:51:35 +01:00
listobject.c bpo-43977: Use tp_flags for collection matching (GH-25723) 2021-04-30 09:50:28 +01:00
listsort.txt Fixes in sorting descriptions (GH-18317) 2020-02-03 08:47:20 -08:00
lnotab_notes.txt bpo-42739: Don't use sentinels to mark end of line table. (GH-25657) 2021-04-29 13:12:51 +01:00
longobject.c [3.10] Fix a potential reference-counting bug in long_pow (GH-26690) (GH-26703) 2021-06-13 08:58:32 +01:00
memoryobject.c bpo-43977: Use tp_flags for collection matching (GH-25723) 2021-04-30 09:50:28 +01:00
methodobject.c bpo-42015: Reorder dereferencing calls in meth_dealloc, to make sure m_self is kept alive long enough (GH-22670) 2020-10-13 00:06:19 +03:00
moduleobject.c bpo-43901: Fix refleaks in test_module (GH-25754) 2021-04-30 17:26:45 +01:00
namespaceobject.c bpo-39075: types.SimpleNamespace no longer sorts attributes in its repr (GH-19430) 2020-05-15 18:27:54 -07:00
object.c bpo-38530: Offer suggestions on AttributeError (#16856) 2021-04-14 02:36:07 +01:00
obmalloc.c When printing stats, move radix tree info to its own section. (GH-25125) 2021-03-31 22:46:31 -05:00
odictobject.c bpo-42536: GC track recycled tuples (GH-23623) 2020-12-04 19:45:57 -08:00
picklebufobject.c bpo-36785: PEP 574 implementation (GH-7076) 2019-05-26 17:10:09 +02:00
rangeobject.c bpo-43977: Use tp_flags for collection matching (GH-25723) 2021-04-30 09:50:28 +01:00
README Issue #18093: Factor out the programs that embed the runtime 2014-07-25 21:52:14 +10:00
setobject.c bpo-43198: Revert 3dd2157 that removed freeslot tracking. (#25010) 2021-03-24 15:33:27 -07:00
sliceobject.c bpo-43268: Pass interp rather than tstate to internal functions (GH-24580) 2021-02-19 15:10:45 +01:00
structseq.c bpo-43916: Move the _PyStructSequence_InitType function to the internal API (GH-25854) 2021-05-03 15:50:24 +01:00
tupleobject.c bpo-43977: Use tp_flags for collection matching (GH-25723) 2021-04-30 09:50:28 +01:00
typeobject.c bpo-44232: Fix type_new() error reporting (GH-26359) (GH-26365) 2021-05-26 11:30:55 +02:00
typeslots.inc bpo-41073: PyType_GetSlot() can now accept static types. (GH-21931) 2020-11-10 12:53:46 -08:00
typeslots.py bpo-41073: PyType_GetSlot() can now accept static types. (GH-21931) 2020-11-10 12:53:46 -08:00
unicodectype.c Removed unintentional trailing spaces in non-external and non-generated C files. 2015-03-18 21:53:15 +02:00
unicodeobject.c [3.10] Add more const modifiers. (GH-26691). (GH-26692) 2021-06-12 18:44:32 +01:00
unicodetype_db.h closes bpo-39926: Update Unicode to 13.0.0. (GH-18910) 2020-03-10 20:41:34 -07:00
unionobject.c bpo-44632: Fix support of TypeVar in the union type (GH-27139) (GH-27143) 2021-07-15 10:25:22 +03:00
weakrefobject.c bpo-44523: Remove the pass-through for hash() in weakref proxy objects (GH-26950) 2021-06-29 16:19:06 -07:00

README 

Source files for various builtin objects