conditionally require exceptiongroup (#183)

also:  add python 3.12 and pypy3.9, 3.10 to CI

.github/workflows/ci.yml

@@ -6,13 +6,15 @@ on:
       - master
   pull_request:
 
+# pylint crashes on 3.12 due to https://github.com/pylint-dev/astroid/issues/2201
+# see https://github.com/pylint-dev/pylint/issues/8782
 jobs:
   build_and_test_pinned:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v3
@@ -52,7 +54,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['pypy-3.7']
+        python-version: ['pypy-3.9','pypy-3.10']
 
     steps:
       - uses: actions/checkout@v3
@@ -70,7 +72,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.11']
+        python-version: ['3.12-dev']
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python

requirements-dev.txt

@@ -20,7 +20,7 @@ click==8.1.3
     # via pip-tools
 coverage[toml]==7.2.1
     # via pytest-cov
-cryptography==39.0.2
+cryptography==41.0.4
     # via trustme
 exceptiongroup==1.1.0
     # via

setup.py

@@ -33,14 +33,15 @@
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
     python_requires=">=3.7",
     keywords='websocket client server trio',
     packages=find_packages(exclude=['docs', 'examples', 'tests']),
     install_requires=[
-        'exceptiongroup',
+        'exceptiongroup; python_version<"3.11"',
         'trio>=0.11',
         'wsproto>=0.14',
     ],

trio_websocket/_impl.py

@@ -13,7 +13,6 @@
 
 import trio
 import trio.abc
-from exceptiongroup import BaseExceptionGroup
 from wsproto import ConnectionType, WSConnection
 from wsproto.connection import ConnectionState
 import wsproto.frame_protocol as wsframeproto
@@ -30,6 +29,10 @@
 )
 import wsproto.utilities
 
+if sys.version_info < (3, 11):  # pragma: no cover
+    # pylint doesn't care about the version_info check, so need to ignore the warning
+    from exceptiongroup import BaseExceptionGroup  # pylint: disable=redefined-builtin
+
 _TRIO_MULTI_ERROR = tuple(map(int, trio.__version__.split('.')[:2])) < (0, 22)
 
 CONN_TIMEOUT = 60 # default connect & disconnect timeout, in seconds
@@ -65,7 +68,7 @@ def __exit__(self, ty, value, tb):
         if value is None or not self._armed:
             return False
 
-        if _TRIO_MULTI_ERROR:
+        if _TRIO_MULTI_ERROR:  # pragma: no cover
             filtered_exception = trio.MultiError.filter(_ignore_cancel, value)  # pylint: disable=no-member
         elif isinstance(value, BaseExceptionGroup):
             filtered_exception = value.subgroup(lambda exc: not isinstance(exc, trio.Cancelled))