Add typing-extensions as an explicit dependency

Add pyupgrade as a pre-commit hook with --py37-plus arg.
Run and upgrade all files accordingly.

Configure mypy to check typing expecting Python 3.7.

.pre-commit-config.yaml

@@ -26,6 +26,16 @@ repos:
     - id: isort
       args: ["--profile", "black", "--filter-files", "--skip-gitignore"]
 
+  # pyupgrade is a tool to automatically upgrade Python syntax for newer versions
+  # It works on files in-place
+  - repo: https://github.com/asottile/pyupgrade
+    # Latest version for Python 3.7: 3.3.2
+    # Latest version for Python 3.8: 3.8.0
+    rev: v3.3.2
+    hooks:
+    - id: pyupgrade
+      args: ["--py37-plus"]
+
   # Black is a code style and formatter
   # It works on files in-place
   - repo: https://github.com/ambv/black

ci_cd/tasks/api_reference_docs.py

@@ -18,6 +18,8 @@
 from ci_cd.utils import Emoji
 
 if TYPE_CHECKING:  # pragma: no cover
+    from typing import List
+
     from invoke import Context, Result
 
 
@@ -121,18 +123,18 @@ def create_api_reference_docs(  # pylint: disable=too-many-locals,too-many-branc
         debug: bool = debug  # type: ignore[no-redef]
 
     if not unwanted_folder:
-        unwanted_folder: list[str] = ["__pycache__"]  # type: ignore[no-redef]
+        unwanted_folder: "List[str]" = ["__pycache__"]  # type: ignore[no-redef]
     if not unwanted_file:
-        unwanted_file: list[str] = ["__init__.py"]  # type: ignore[no-redef]
+        unwanted_file: "List[str]" = ["__init__.py"]  # type: ignore[no-redef]
     if not full_docs_folder:
-        full_docs_folder: list[str] = []  # type: ignore[no-redef]
+        full_docs_folder: "List[str]" = []  # type: ignore[no-redef]
     if not full_docs_file:
-        full_docs_file: list[str] = []  # type: ignore[no-redef]
+        full_docs_file: "List[str]" = []  # type: ignore[no-redef]
     if not special_option:
-        special_option: list[str] = []  # type: ignore[no-redef]
+        special_option: "List[str]" = []  # type: ignore[no-redef]
 
     # Initialize user-given paths as pure POSIX paths
-    package_dir: list[PurePosixPath] = [PurePosixPath(_) for _ in package_dir]
+    package_dir: "List[PurePosixPath]" = [PurePosixPath(_) for _ in package_dir]
     root_repo_path = str(PurePosixPath(root_repo_path))
     docs_folder: PurePosixPath = PurePosixPath(docs_folder)  # type: ignore[no-redef]
     full_docs_folder = [Path(PurePosixPath(_)) for _ in full_docs_folder]
@@ -161,7 +163,7 @@ def write_file(full_path: Path, content: str) -> None:
         root_repo_path = result.stdout.strip("\n")  # type: ignore[no-redef]
 
     root_repo_path: Path = Path(root_repo_path).resolve()  # type: ignore[no-redef]
-    package_dirs: list[Path] = [Path(root_repo_path / _) for _ in package_dir]
+    package_dirs: "List[Path]" = [Path(root_repo_path / _) for _ in package_dir]
     docs_api_ref_dir = Path(root_repo_path / docs_folder / "api_reference")
 
     LOGGER.debug(

ci_cd/tasks/docs_index.py

@@ -12,6 +12,8 @@
 from ci_cd.utils import Emoji
 
 if TYPE_CHECKING:  # pragma: no cover
+    from typing import List
+
     from invoke import Context, Result
 
 
@@ -56,7 +58,7 @@ def create_docs_index(  # pylint: disable=too-many-locals
     docs_folder: Path = Path(docs_folder)
 
     if not replacement:
-        replacement: list[str] = []  # type: ignore[no-redef]
+        replacement: "List[str]" = []  # type: ignore[no-redef]
     replacement.append(f"{docs_folder.name}/{replacement_separator}")
 
     if pre_commit and root_repo_path == ".":

ci_cd/tasks/setver.py

@@ -13,6 +13,9 @@
 
 from ci_cd.utils import Emoji, SemanticVersion, update_file
 
+if TYPE_CHECKING:  # pragma: no cover
+    from typing import List
+
 # Get logger
 LOGGER = logging.getLogger(__name__)
 
@@ -63,7 +66,7 @@ def setver(  # pylint: disable=too-many-locals
         package_dir: str = package_dir  # type: ignore[no-redef]
         version: str = version  # type: ignore[no-redef]
         root_repo_path: str = root_repo_path  # type: ignore[no-redef]
-        code_base_update: list[str] = code_base_update  # type: ignore[no-redef]
+        code_base_update: List[str] = code_base_update  # type: ignore[no-redef]
         code_base_update_separator: str = code_base_update_separator  # type: ignore[no-redef]  # pylint: disable=line-too-long
         test: bool = test  # type: ignore[no-redef]
         fail_fast: bool = fail_fast  # type: ignore[no-redef]
@@ -100,7 +103,7 @@ def setver(  # pylint: disable=too-many-locals
             ),
         )
     else:
-        errors: list[str] = []
+        errors: "List[str]" = []
         for code_update in code_base_update:
             try:
                 filepath, pattern, replacement = code_update.split(

ci_cd/tasks/update_deps.py

@@ -105,7 +105,7 @@ def update_deps(  # pylint: disable=too-many-branches,too-many-locals,too-many-s
 ):
     """Update dependencies in specified Python package's `pyproject.toml`."""
     if TYPE_CHECKING:  # pragma: no cover
-        context: "Context" = context  # type: ignore[no-redef]
+        context: Context = context  # type: ignore[no-redef]
         root_repo_path: str = root_repo_path  # type: ignore[no-redef]
         fail_fast: bool = fail_fast  # type: ignore[no-redef]
         pre_commit: bool = pre_commit  # type: ignore[no-redef]
@@ -130,7 +130,7 @@ def update_deps(  # pylint: disable=too-many-branches,too-many-locals,too-many-s
 
     if pre_commit and root_repo_path == ".":
         # Use git to determine repo root
-        result: "Result" = context.run("git rev-parse --show-toplevel", hide=True)
+        result: Result = context.run("git rev-parse --show-toplevel", hide=True)
         root_repo_path = result.stdout.strip("\n")
 
     pyproject_path = Path(root_repo_path).resolve() / "pyproject.toml"
@@ -261,7 +261,7 @@ def update_deps(  # pylint: disable=too-many-branches,too-many-locals,too-many-s
             LOGGER.debug("Min/max Python version from marker: %s", marker_py_version)
 
         # Check version from PyPI's online package index
-        out: "Result" = context.run(
+        out: Result = context.run(
             "pip index versions "
             f"--python-version {marker_py_version or py_version} "
             f"{parsed_requirement.name}",
@@ -342,8 +342,8 @@ def update_deps(  # pylint: disable=too-many-branches,too-many-locals,too-many-s
 
         # Apply ignore rules
         if parsed_requirement.name in ignore_rules or "*" in ignore_rules:
-            versions: "IgnoreVersions" = []
-            update_types: "IgnoreUpdateTypes" = {}
+            versions: IgnoreVersions = []
+            update_types: IgnoreUpdateTypes = {}
 
             if "*" in ignore_rules:
                 versions, update_types = parse_ignore_rules(ignore_rules["*"])