python-hypothesis/hypothesis-py39-namedtuple.patch

From 99f99513ce19968ea0e5da15ba2084c32e6d0a2d Mon Sep 17 00:00:00 2001
From: Michel Alexandre Salim <michel@michel-slm.name>
Date: Tue, 12 May 2020 11:14:08 -0700
Subject: [PATCH] Add support for Python 3.9's NamedTuple changes

In Python 3.9, NamedTuples no longer have a `_field_type` attribute;
it has been deprecated since Python 3.8 and the `__annotations__`
attribute has identical information:

```
>>> from typing import NamedTuple
>>> class MyNT(NamedTuple):
...     x: int
...     y: int = 1
...
...
>>> issubclass(P, tuple)
True
>>> issubclass(P, NamedTuple)
False
>>> hasattr(MyNT, "_fields")
True
>>> hasattr(MyNT, "_field_types")
True
>>> hasattr(MyNT, "__annotations__")
True
>>> MyNT._field_types
{'x': <class 'int'>, 'y': <class 'int'>}
>>> MyNT.__annotations__
{'x': <class 'int'>, 'y': <class 'int'>}
```

see https://bugs.python.org/issue40182

Testing for the existence of *either* `_field_types` or
`__annotations__` fixes the four failing tests on Python 3.9:

```
/builddir/build/BUILD/hypothesis-hypothesis-python-5.12.0/hypothesis-python
<mock-chroot> sh-5.0# PYTHONPATH=/builddir/build/BUILDROOT/python-hypothesis-5.12.0-1.fc33.x86_64/usr/lib/python3.9/site-packages pytest tests/cover/test_lookup.py::test_infers_args_f
or_namedtuple_builds
==================== test session starts ====================
platform linux -- Python 3.9.0a6, pytest-4.6.10, py-1.8.0, pluggy-0.13.0
rootdir: /builddir/build/BUILD/hypothesis-hypothesis-python-5.12.0, inifile: pytest.ini
plugins: hypothesis-5.12.0, xdist-1.32.0, forked-1.1.1
collected 1 item

tests/cover/test_lookup.py .                          [100%]

================= slowest 20 test durations =================
0.23s call     hypothesis-python/tests/cover/test_lookup.py::test_infers_args_for_namedtuple_builds
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_infers_args_for_namedtuple_builds

(0.00 durations hidden.  Use -vv to show these durations.)
================= 1 passed in 0.45 seconds ==================
<mock-chroot> sh-5.0# grep -rl test_infers_args_for_namedtuple_builds *
tests/cover/__pycache__/test_lookup.cpython-39-PYTEST.pyc
tests/cover/test_lookup.py
<mock-chroot> sh-5.0# PYTHONPATH=/builddir/build/BUILDROOT/python-hypothesis-5.12.0-1.fc33.x86_64/usr/lib/python3.9/site-packages pytest tests/cover/test_lookup.py::test_infers_args_for_namedtuple_from_type
==================== test session starts ====================
platform linux -- Python 3.9.0a6, pytest-4.6.10, py-1.8.0, pluggy-0.13.0
rootdir: /builddir/build/BUILD/hypothesis-hypothesis-python-5.12.0, inifile: pytest.ini
plugins: hypothesis-5.12.0, xdist-1.32.0, forked-1.1.1
collected 1 item

tests/cover/test_lookup.py .                          [100%]

================= slowest 20 test durations =================
0.20s call     hypothesis-python/tests/cover/test_lookup.py::test_infers_args_for_namedtuple_from_type
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_infers_args_for_namedtuple_from_type

(0.00 durations hidden.  Use -vv to show these durations.)
================= 1 passed in 0.42 seconds ==================
<mock-chroot> sh-5.0# grep -rl test_resolves_forward_references_outside_annotations *
tests/cover/test_lookup_py36.py
tests/cover/__pycache__/test_lookup_py36.cpython-39-PYTEST.pyc
<mock-chroot> sh-5.0# PYTHONPATH=/builddir/build/BUILDROOT/python-hypothesis-5.12.0-1.fc33.x86_64/usr/lib/python3.9/site-packages pytest tests/cover/test_lookup_py36.py::test_resolves
_forward_references_outside_annotations
==================== test session starts ====================
platform linux -- Python 3.9.0a6, pytest-4.6.10, py-1.8.0, pluggy-0.13.0
rootdir: /builddir/build/BUILD/hypothesis-hypothesis-python-5.12.0, inifile: pytest.ini
plugins: hypothesis-5.12.0, xdist-1.32.0, forked-1.1.1
collected 1 item

tests/cover/test_lookup_py36.py .                     [100%]

================= slowest 20 test durations =================
0.93s call     hypothesis-python/tests/cover/test_lookup_py36.py::test_resolves_forward_references_outside_annotations
0.01s setup    hypothesis-python/tests/cover/test_lookup_py36.py::test_resolves_forward_references_outside_annotations

(0.00 durations hidden.  Use -vv to show these durations.)
================= 1 passed in 0.95 seconds ==================
<mock-chroot> sh-5.0# PYTHONPATH=/builddir/build/BUILDROOT/python-hypothesis-5.12.0-1.fc33.x86_64/usr/lib/python3.9/site-packages pytest tests/cover/test_lookup.py::test_infers_args_for_namedtuple_from_type^C
<mock-chroot> sh-5.0# grep -rl test_specialised_collection_types *
tests/cover/__pycache__/test_lookup.cpython-39-PYTEST.pyc
tests/cover/test_lookup.py
<mock-chroot> sh-5.0# PYTHONPATH=/builddir/build/BUILDROOT/python-hypothesis-5.12.0-1.fc33.x86_64/usr/lib/python3.9/site-packages pytest tests/cover/test_lookup.py::test_specialised_collection_types
==================== test session starts ====================
platform linux -- Python 3.9.0a6, pytest-4.6.10, py-1.8.0, pluggy-0.13.0
rootdir: /builddir/build/BUILD/hypothesis-hypothesis-python-5.12.0, inifile: pytest.ini
plugins: hypothesis-5.12.0, xdist-1.32.0, forked-1.1.1
collected 14 items

tests/cover/test_lookup.py ..............             [100%]

================= slowest 20 test durations =================
0.44s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ12-coll_type12-int]
0.34s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ2-dict-int]
0.34s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ4-dict_values-int]
0.34s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ11-coll_type11-int]
0.31s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ3-dict_keys-int]
0.30s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ10-coll_type10-int]
0.28s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ0-set-int]
0.26s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ1-frozenset-int]
0.23s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ9-coll_type9-int]
0.21s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ7-tuple-int]
0.20s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ5-list-int]
0.19s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ8-coll_type8-int]
0.13s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[A_NamedTuple-tuple-int]
0.10s call     hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ6-tuple-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ2-dict-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ0-set-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[A_NamedTuple-tuple-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ10-coll_type10-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ11-coll_type11-int]
0.02s setup    hypothesis-python/tests/cover/test_lookup.py::test_specialised_collection_types[typ4-dict_values-int]
================= 14 passed in 4.11 seconds =================
```

This addresses issue #2427 .
---
 hypothesis-python/src/hypothesis/internal/compat.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hypothesis-python/src/hypothesis/internal/compat.py b/hypothesis-python/src/hypothesis/internal/compat.py
index 08853a6b80..fd045a3464 100644
--- a/hypothesis-python/src/hypothesis/internal/compat.py
+++ b/hypothesis-python/src/hypothesis/internal/compat.py
@@ -92,7 +92,9 @@ def is_typed_named_tuple(cls):
     return (
         issubclass(cls, tuple)
         and hasattr(cls, "_fields")
-        and hasattr(cls, "_field_types")
+        and (hasattr(cls, "_field_types")
+            or hasattr(cls, "__annotations__")
+            )
     )