Support Python 3.11

This adds support for targetting Python 3.11 via picking up the
latest grammar from parso while also validating support for running
on 3.11 by adding it to the CI matrix.

.github/workflows/ci.yml

@@ -7,8 +7,8 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04, windows-2019]
-        python-version: ["3.10", "3.9", "3.8", "3.7", "3.6"]
-        environment: ['3.8', '3.10', '3.9', '3.7', '3.6', 'interpreter']
+        python-version: ["3.11", "3.10", "3.9", "3.8", "3.7", "3.6"]
+        environment: ['3.8', '3.11', '3.10', '3.9', '3.7', '3.6', 'interpreter']
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

jedi/api/environment.py

@@ -17,7 +17,7 @@ import parso
 
 _VersionInfo = namedtuple('VersionInfo', 'major minor micro')  # type: ignore[name-match]
 
-_SUPPORTED_PYTHONS = ['3.10', '3.9', '3.8', '3.7', '3.6']
+_SUPPORTED_PYTHONS = ['3.11', '3.10', '3.9', '3.8', '3.7', '3.6']
 _SAFE_PATHS = ['/usr/bin', '/usr/local/bin']
 _CONDA_VAR = 'CONDA_PREFIX'
 _CURRENT_VERSION = '%s.%s' % (sys.version_info.major, sys.version_info.minor)

jedi/inference/__init__.py

@@ -90,7 +90,7 @@ class InferenceState:
         self.compiled_subprocess = environment.get_inference_state_subprocess(self)
         self.grammar = environment.get_grammar()
 
-        self.latest_grammar = parso.load_grammar(version='3.10')
+        self.latest_grammar = parso.load_grammar(version='3.11')
         self.memoize_cache = {}  # for memoize decorators
         self.module_cache = imports.ModuleCache()  # does the job of `sys.modules`.
         self.stub_module_cache = {}  # Dict[Tuple[str, ...], Optional[ModuleValue]]

setup.py

@@ -32,7 +32,8 @@ setup(name='jedi',
       long_description=readme,
       packages=find_packages(exclude=['test', 'test.*']),
       python_requires='>=3.6',
-      install_requires=['parso>=0.8.0,<0.9.0'],
+      # Python 3.11 grammar is added to parso in 0.8.3
+      install_requires=['parso>=0.8.3,<0.9.0'],
       extras_require={
           'testing': [
               'pytest<7.0.0',
@@ -95,6 +96,7 @@ setup(name='jedi',
           'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',
           'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11',
           'Topic :: Software Development :: Libraries :: Python Modules',
           'Topic :: Text Editors :: Integrated Development Environments (IDE)',
           'Topic :: Utilities',