lint: some typing imports

adjust: readme

docs/README.rst

@@ -1,7 +1,46 @@
 README
 ======
 
-.. APIDOCS command: sphinx-apidoc -o docs/apidocs -eMTf src
-
 .. include:: ../README.md
    :parser: myst_parser.sphinx_
+
+How to build docs
+=================
+
+#. This documentation is made with `Sphinx <https://www.sphinx-doc.org/>`_, be sure to install it's dependencies:
+
+   .. code:: sh
+
+      pip install -r docs/requirements.txt
+
+   Ignore this step if requirements already installed.
+
+#. (*Optional*) Re-generate API-Docs, if source tree changed:
+
+   .. code:: sh
+
+      sphinx-apidoc -o docs/apidocs -eMTf src
+
+#. Build HTML documentation:
+
+   .. code:: sh
+
+      docs/make html
+
+The built static web site is output to ``docs/_build/html``, we can serve it:
+
+.. code:: sh
+
+   python -m http.server -d docs/_build/html
+
+then open http://localhost:8000/ in a web browser.
+
+.. tip::
+   Try another port if ``8000`` is already in use.
+   For example, to serve on port ``8080``:
+
+   .. code:: sh
+
+      python -m http.server -d docs/_build/html 8080
+
+   .. seealso:: Python ``stdlib``'s :mod:`http.server`

src/sqlalchemy_dlock/asyncio/lock/mysql.py

@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Callable, Union
+from typing import Union
 
 from ...exceptions import SqlAlchemyDLockDatabaseError
 from ...lock.mysql import MysqlSadLockMixin
@@ -13,8 +13,6 @@
 
 MYSQL_LOCK_NAME_MAX_LENGTH = 64
 
-TConvertFunction = Callable[[Any], str]
-
 
 def default_convert(key: Union[bytearray, bytes, int, float]) -> str:
     if isinstance(key, (bytearray, bytes)):

src/sqlalchemy_dlock/lock/mysql.py

@@ -1,5 +1,6 @@
 import sys
-from typing import Any, Callable, Optional, Union
+from collections.abc import Callable
+from typing import Any, Optional, Union
 
 from ..exceptions import SqlAlchemyDLockDatabaseError
 from ..statement.mysql import LOCK, UNLOCK

src/sqlalchemy_dlock/lock/postgresql.py

@@ -1,6 +1,7 @@
 import sys
+from collections.abc import Callable
 from time import sleep, time
-from typing import Any, Callable, Optional, Union
+from typing import Any, Optional, Union
 from warnings import warn
 
 from ..exceptions import SqlAlchemyDLockDatabaseError