Add pyright to project. Fix errors reported by pyright.

pyproject.toml

@@ -27,11 +27,10 @@ python = "^3.11"
 pylint = "^2.17.4"
 pytest = "^7.3.1"
 yapf = "^0.33.0"
+pyright = "^1.1.314"
 
 [tool.pytest.ini_options]
-addopts = [
-    "--import-mode=importlib",
-]
+addopts = ["--import-mode=importlib"]
 pythonpath = "src"
 
 [tool.yapfignore]
@@ -43,6 +42,14 @@ ignore_patterns = [
 [tool.yapf]
 based_on_style = "yapf"
 
+[tool.pyright]
+include = ["src"]
+exclude = ["dev_files/*.py"]
+strict = ["src/gaggle"]
+reportMissingImports = true
+reportUntypedFunctionDecorator = true
+reportUntypedClassDecorator = true
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"

src/gaggle/exceptions.py

@@ -77,7 +77,8 @@ class LeftoverArgumentWarning(Warning):
   """Gaggle warning when extra arguments remain after a function call. The extra
   arguments were not necessary to successfully complete the function call."""
 
-  def __init__(self, context_message, leftovers, leftover_name):
+  def __init__(self, context_message: Any, leftovers: Iterable[Any],
+               leftover_name: Any):
     self.leftovers = leftovers
     self.message = self._create_message(context_message, leftover_name)
 
@@ -157,7 +158,7 @@ def from_values(cls, *values: Iterable[Any], **kwargs: str) -> Self:
     iterator = itertools.chain(*values)
     return cls.from_iterator(iterator=iterator, **kwargs)
 
-  def _create_message(self, context_message, leftover_name):
+  def _create_message(self, context_message: Any, leftover_name: Any) -> str:
     """Creates value of LeftoverArgumentWarning.message
 
     Args: