More Typing Adoption (#873)

Author: blink1073

pyproject.toml

@@ -56,7 +56,7 @@ nowarn = "test -W default {args}"
 [tool.hatch.envs.typing]
 features = ["test"]
 [tool.hatch.envs.typing.scripts]
-test = "mypy --install-types --non-interactive {args:.}"
+test = "mypy --install-types --non-interactive {args}"
 
 [tool.hatch.envs.lint]
 dependencies = ["black==23.3.0", "mdformat>0.7", "ruff==0.0.281"]
@@ -74,6 +74,7 @@ fmt = [
 ]
 
 [tool.mypy]
+files = "traitlets"
 python_version = "3.8"
 check_untyped_defs = true
 disallow_any_generics = true
@@ -97,7 +98,7 @@ exclude = ["examples/docs/configs", "traitlets/tests/test_typing.py"]
 [tool.pytest.ini_options]
 addopts = "--durations=10 -ra --showlocals --doctest-modules --color yes --ignore examples/docs/configs"
 testpaths = [
-    "traitlets",
+    "tests",
     "examples",
 ]
 filterwarnings = [
@@ -153,10 +154,18 @@ target-version = ["py37"]
 target-version = "py37"
 line-length = 100
 select = [
-  "A", "B", "C", "E", "F", "FBT", "I", "N", "Q", "RUF", "S", "T",
+  "A", "ANN", "B", "C", "E", "F", "FBT", "I", "N", "Q", "RUF", "S", "T",
   "UP", "W", "YTT",
 ]
 ignore = [
+  # Dynamically typed expressions (typing.Any) are disallowed in `key`
+  "ANN401",
+  # Missing type annotation for `self` in method
+  "ANN101",
+  #  Missing type annotation for `cls` in classmethod
+  "ANN102",
+  # ANN202 Missing return type annotation for private function
+  "ANN202",
   # Allow non-abstract empty methods in abstract base classes
   "B027",
   # Ignore McCabe complexity
@@ -211,11 +220,13 @@ unfixable = [
 # N802 Function name `assertIn` should be lowercase
 # F841 Local variable `t` is assigned to but never used
 # B018 Found useless expression
-# S301 `pickle` and modules that wrap...
-"traitlets/tests/*" = ["B011", "F841", "C408", "E402", "T201", "B007", "N802", "F841",
+# S301 `pickle` and modules that wrap..."
+"tests/*" = ["ANN", "B011", "F841", "C408", "E402", "T201", "B007", "N802", "F841",
                        "B018", "S301"]
 # B003 Assigning to os.environ doesn't clear the environment
-"traitlets/config/tests/*" = ["B003", "B018", "S301"]
+"tests/config/*" = ["B003", "B018", "S301"]
 # F401 `_version.__version__` imported but unused
 # F403 `from .traitlets import *` used; unable to detect undefined names
 "traitlets/*__init__.py" = ["F401", "F403"]
+"docs/*" = ["ANN"]
+"examples/*" = ["ANN"]

traitlets/config/tests/__init__.py tests/__init__.pytraitlets/config/tests/__init__.py renamed to tests/__init__.py

@@ -601,7 +601,7 @@ def test_raise_on_bad_config(self):
             with self.assertRaises(SyntaxError):
                 app.load_config_file(name, path=[td])
 
-    def test_subcommands_instanciation(self):
+    def test_subcommands_instantiation(self):
         """Try all ways to specify how to create sub-apps."""
         app = Root.instance()
         app.parse_command_line(["sub1"])
@@ -694,7 +694,7 @@ class App(Application):
 
 class Root(Application):
     subcommands = {
-        "sub1": ("traitlets.config.tests.test_application.Sub1", "import string"),
+        "sub1": ("tests.config.test_application.Sub1", "import string"),
     }
 
 

traitlets/tests/_warnings.py tests/_warnings.pytraitlets/tests/_warnings.py renamed to tests/_warnings.py

@@ -8,6 +8,7 @@
 
 from pytest import mark
 
+from tests._warnings import expected_warnings
 from traitlets.config.application import Application
 from traitlets.config.configurable import Configurable, LoggingConfigurable, SingletonConfigurable
 from traitlets.config.loader import Config
@@ -26,8 +27,6 @@
 )
 from traitlets.utils.warnings import _deprecations_shown
 
-from ...tests._warnings import expected_warnings
-
 
 class MyConfigurable(Configurable):
     a = Integer(1, help="The integer a.").tag(config=True)