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Title: bpo-39481: Implementation for PEP 585 by gvanrossum · Pull Request #18239 · python/cpython · GitHub

Open Graph Title: bpo-39481: Implementation for PEP 585 by gvanrossum · Pull Request #18239 · python/cpython

X Title: bpo-39481: Implementation for PEP 585 by gvanrossum · Pull Request #18239 · python/cpython

Description: I consider this a finished prototype now. We've got everything working, and then some (e.g. pickle), and while we found a fair number of minor issues with PEP 585, the main conclusion is that the PEP is quite reasonable to implement. A number of suggestions for changes PEP 585 that have basically been vetted by @ambv can be found in python/peps#1289. There are a few places where I still disagree with @ambv. In particular, I don't think it makes sense to even allow isinstance(x, list[int]) and issubclass(C, list[int]) -- IMO these should just raise TypeError, and that's what this PR implements. (If @ambv convinces me to change my mind, it's easy to revert that.) [UPDATE: @ambv agrees and has updated the PEP.] There are also a few things that ought to be changed: We should add a nice docstring to GenericAlias. We made io.IOBase generic. This was a misunderstanding, and we'll revert that. The __parameters__ attribute can and probably should be computed lazily the first time it's needed. Maybe we still need a cache, like typing.py uses? Where should the code live? For now I put it in descrobject.c, but that's debatable (it was just convenient). https://bugs.python.org/issue39481

Open Graph Description: I consider this a finished prototype now. We've got everything working, and then some (e.g. pickle), and while we found a fair number of minor issues with PEP 585, the main conclusion is that t...

X Description: I consider this a finished prototype now. We've got everything working, and then some (e.g. pickle), and while we found a fair number of minor issues with PEP 585, the main conclusion is th...

Opengraph URL: https://github.com/python/cpython/pull/18239

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d557a64 PEP 585 step 2: Write a Py_GenericAlias() function that returns origin gvanrossum Jan 27, 2020 https://github.com/python/cpython/pull/18239/commits/d557a64a4cc82230a8a0368404a3862996effc3e
da33267 PEP 585 step 3: Add Py_GenericAlias() as __class_getitem__ to tuple, … gvanrossum Jan 27, 2020 https://github.com/python/cpython/pull/18239/commits/da332673eccb81a3e5f173f02e33871930ad7d64
447fbe9 PEP 585 step 4: Write some tests gvanrossum Jan 27, 2020 https://github.com/python/cpython/pull/18239/commits/447fbe9308de63b15d99c2c3e6c6c5b960eeb801
83e2ba2 Define a GenericAlias (proxy) object (with lots of TODOs still) gvanrossum Jan 27, 2020 https://github.com/python/cpython/pull/18239/commits/83e2ba25481768d867d0534d2aa7a66fc45b37a7
fb3e8d3 More tests gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/fb3e8d389394660b35673d084c056b58fde2e0bf
235180b PEP 585 steps 5-6: Finish basic GenericAlias object and test gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/235180b767f5f455873c8638f1b39c377aa2254e
70f3abc Fix bug with class methods gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/70f3abc1609305f8d37fe47638d6bbd9da38a9ce
e4d1356 Define tp_new instead of tp_init gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/e4d1356edfd758387fc838a87f03628c201c2aae
8f7a55e Test that list[int][int] fails gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/8f7a55e31f97d0bc7e82394a5d17244f59e31bf3
f2ba2e5 Test that class L(list): pass; L[int] works gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/f2ba2e53c09be858736e866c05b2acd671fa6176
0af74d1 Implement PEP 585 for collections.deque and ... (#2) emmatyping Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/0af74d105b66621ee666b8dcaf2a518fb7ea2d30
b264294 Respond to Serhiy's code review gvanrossum Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/b2642948cd0de776cd2315119b366847c3ad5735
0ddea56 📜🤖 Added by blurb_it. blurb-it[bot] Jan 28, 2020 https://github.com/python/cpython/pull/18239/commits/0ddea5628af6f799e98a02886fbe3c46ce43c4a7
91edf1c PEP 585 steps 7-8: Implement repr for GenericAlias (#1) emmatyping Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/91edf1c6b22f2ff94ad7b6fe7490068a619b19e0
6b1a218 Add static keyword to ga_repr_item (#3) emmatyping Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/6b1a218162e45e83de7be8e6bfaa4984b3963e66
ce21a96 Add GenericAlias to types.py gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/ce21a96d2c32718550af45f8279bbb47013cf40a
dbe67d0 Add test for types.py gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/dbe67d0b995adbafffc3f11f2bbbb5522bba6899
15697f0 Fix tests that were sensitive to the presence of __class_getitem__ gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/15697f09c9674763d493b683c3f193334c1b3a73
da15d43 Fix crash in repr(tuple[...]) -- call PyErr_Clear() gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/da15d43335abb002b6c36332881c3af4b25bb3d8
647cda8 Make re.Match, re.Pattern, and io.IOBase generic (#4) emmatyping Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/647cda8fab6cc18a7dbbec1ffc51513231d5a427
3824954 Restore parity between _io._IOBase and _pyio.IOBase gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/382495476ffe1efd03f790c043c4d2adb6b4aa03
8aec6ae Make contextlib.Abstract*ContextManager generic, with tests gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/8aec6ae15063388bd4902c45500042522da4744d
58af183 WIP: Tweak test_typing.py to pass with the new definition of __orig_c… gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/58af1834d51c27b21132173509f07714887822a9
8da0a08 Rename __parameters__ to __args__ gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/8da0a089f5a3561438bed0fff5dbac6b87ae262c
eaecacb Rename parameters to args gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/eaecacb060805df0223b2123d04d9f91b8b3a3b3
98d479f Properly implement __parameters__ as the tuple of args that are type … gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/98d479fc198281ab84b79a6fd8ea257e2923fb14
82bc806 Set __orig_class__ if possible when instantiating gvanrossum Jan 29, 2020 https://github.com/python/cpython/pull/18239/commits/82bc8060b378c842e9af24a3cbc4bb1d4d39cfb1
2567ce3 WIP: Implement ga_getitem so list[T][int] -> list[int] gvanrossum Jan 30, 2020 https://github.com/python/cpython/pull/18239/commits/2567ce37a5f910ff7be570e69eca90eea03bf7d5
4f2ced6 Exclude duplicates from __parameters__ gvanrossum Jan 30, 2020 https://github.com/python/cpython/pull/18239/commits/4f2ced6b4e61d23fa487cfabe0ce3a459e0b3f49
2c25fb0 Implement ga_getitem properly, with tests gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/2c25fb0b4cf78836d471094a10142633573411d5
9ed17ef Implement == and != for GA gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/9ed17ef14738dd71b65c50394e438350f26f20b0
bb9a11f Make collections.abc.* generic (#5) emmatyping Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/bb9a11ffd15b2002f7077ac6dbff7f09b62e63c3
6d3f535 Make isinstance and issubclass error for GenericAlias (#6) emmatyping Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/6d3f5357d322ef705fda36b8bbb97af31a627dd9
4b3ecf2 Fix two more AssertIs calls in test_typing.py gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/4b3ecf287c70017d2001b34677fcf90749db3d2b
2df602b Admit defeat -- comment out two expected TypeErrors in test_extended_… gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/2df602bca7a68fe8bf8c979d71e614e341691b76
eede65a Fix whitespace to satisfy patchcheck.py gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/eede65a1eeb6a23072ef7c7c214d669a62125cd2
2b22f6e Fix test_site.py gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/2b22f6e75618f8327ee1a65681e1b3d2fcbcb945
065a032 Better way to fix test_site.py: don't import types from collections gvanrossum Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/065a032653b547a2a98890736b52db7765f7edcd
baf9b32 Use Py_ssize_t instead of int for indexing (#8) emmatyping Jan 31, 2020 https://github.com/python/cpython/pull/18239/commits/baf9b32218e19b35d63f6225771244df6491f9ff
9915ba2 GenericAlias pickle support (#9) emmatyping Feb 5, 2020 https://github.com/python/cpython/pull/18239/commits/9915ba2bea0c1eb6b2f5838521dbebcaf8c5c19b
4e1da19 Make type generic (#7) emmatyping Feb 5, 2020 https://github.com/python/cpython/pull/18239/commits/4e1da193e3b36cc62c2113a37ebf329431348acc
8926f7a Remove a completed TODO comment gvanrossum Feb 5, 2020 https://github.com/python/cpython/pull/18239/commits/8926f7aa1131d4805c9a9174c05e38d7cbcff8ce
7b1ad20 Remove extraneous whitespace. (#10) emmatyping Feb 5, 2020 https://github.com/python/cpython/pull/18239/commits/7b1ad200849e09293b0283633193211731e9396a
a05d9ae Do not make IOBase generic (#11) emmatyping Feb 7, 2020 https://github.com/python/cpython/pull/18239/commits/a05d9ae1da8e8137e0881fe51226cc08cb195be1
d4a372b Remove __class_getitem__ from _pyio.py too; and don't test for IOBase gvanrossum Feb 7, 2020 https://github.com/python/cpython/pull/18239/commits/d4a372bbc77f9506a6332ae5b4875d5855b271ec
c534f67 Merge branch 'master' into pep585 gvanrossum Feb 10, 2020 https://github.com/python/cpython/pull/18239/commits/c534f67b703527e61d4e41fd3de28e91491b2f7e
2f94a36 Make types.MappingProxyType generic (#13) emmatyping Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/2f94a36df0fe1ff7d738f5daea438fae0c2cad2d
3da2797 Reword isinstance/subclass checks (#12) emmatyping Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/3da279795e5eab8da47eeb2ce34b9925f07bdf5c
13d8d6d Fix test_types (mappingproxy now has a __class_getitem__ method) gvanrossum Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/13d8d6d32e36affb7ae9491a9bea5381b1c6c17e
43a97b9 Merge remote-tracking branch 'upstream/master' into pep585 gvanrossum Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/43a97b9b17ddcd931cdaa1faa6e14f824f956206
4783c2e Convert some already generic things to GenericAlias to be consistent … emmatyping Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/4783c2e8a92fa8e73b8a770f3af8ec43626a23fd
e50136d Make __parameters__ lazy (#15) emmatyping Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/e50136dd92c4a8f18932613dcd738a001ac513b9
0192986 Fix failing test_doctest -- we now find 821 tests gvanrossum Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/01929866fe2278d37c632c0c108f4ef20aed4d79
b80b077 Don't import types in os.py -- it breaks test_site.py gvanrossum Feb 25, 2020 https://github.com/python/cpython/pull/18239/commits/b80b0770268424174b2a6605bd7def923694b0b2
3bc4e12 Move GenericAlias definition to its own file gvanrossum Mar 14, 2020 https://github.com/python/cpython/pull/18239/commits/3bc4e127cc1807100c4cd68a6815c91c32c2289a
f658a64 Add a hash function to GenericAlias gvanrossum Mar 14, 2020 https://github.com/python/cpython/pull/18239/commits/f658a64f94e16ee543e03fb335d51f0dfaec522b
bfd6342 Make Union[list[T], int] work gvanrossum Mar 15, 2020 https://github.com/python/cpython/pull/18239/commits/bfd6342c0ee4b3c83e6235efad2200b9ff3aa607
7919fa2 Add GenericAlias to Windows build (#16) emmatyping Mar 16, 2020 https://github.com/python/cpython/pull/18239/commits/7919fa24526bb014a183563c848865bc869c1ddd
854fa99 Merge remote-tracking branch 'upstream/master' into pep585 gvanrossum Mar 16, 2020 https://github.com/python/cpython/pull/18239/commits/854fa9971934cebe58f52a4c4971684a0f4d547a
728084a Run CI on PRs for pep585 branch gvanrossum Mar 18, 2020 https://github.com/python/cpython/pull/18239/commits/728084a49bc62b46217d9accbf9a2011bb6ffb88
29130ab Merge branch 'master' into pep585 gvanrossum Mar 29, 2020 https://github.com/python/cpython/pull/18239/commits/29130ab4c2a3fa441e60ff6a98562d8755489a4c
ddbce27 Add docstring for GenericAlias (#17) emmatyping Mar 30, 2020 https://github.com/python/cpython/pull/18239/commits/ddbce27bc8716e8fc0acbae0907691b0d41b3cae
4db065d Remove unneeded _GenericAlias definition from collections/__init__.py gvanrossum Mar 31, 2020 https://github.com/python/cpython/pull/18239/commits/4db065d9662b003047450f10e5b8184fd5e4e647
e14625f Make is_typevar() harder to fool gvanrossum Apr 5, 2020 https://github.com/python/cpython/pull/18239/commits/e14625fa30d74a872f2f6af390ce2564c6b3e1b5
76c0805 Rewrite ga_repr_item() to honor exceptions gvanrossum Apr 5, 2020 https://github.com/python/cpython/pull/18239/commits/76c080534dc282ca42c0d7ccbb920b914afe887b
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