chore: Drop support for Python3.7 and 3.8 due to the lack of support for TypedDict and | operator

Author: fgmacedo

.github/ISSUE_TEMPLATE.md

@@ -13,3 +13,5 @@ Tell us what happened, what went wrong, and what you expected to happen.
 Paste the command(s) you ran and the output.
 If there was a crash, please include the traceback here.
 ```
+
+If you're reporting a bug, consider providing a complete example that can be used directly in the automated tests. We allways write tests to reproduce the issue in order to avoid future regressions.

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v4
@@ -33,10 +33,6 @@ jobs:
         cache-suffix: "python${{ matrix.python-version }}"
     - name: Install the project
       run: uv sync --all-extras --dev
-    - name: Install old pydot for 3.7 only
-      if: matrix.python-version == 3.7
-      run: |
-        uv pip install pydot==2.0.0
       #----------------------------------------------
       #              run ruff
       #----------------------------------------------

pyproject.toml

@@ -17,13 +17,11 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Topic :: Home Automation",
     "Topic :: Software Development :: Libraries",
 ]
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 
 [project.urls]
 homepage = "https://github.com/fgmacedo/python-statemachine"
@@ -44,15 +42,15 @@ dev = [
     "pytest-asyncio",
     "pydot",
     "django >=5.0.8; python_version >='3.10'",
-    "pytest-django >=4.8.0; python_version >'3.8'",
-    "Sphinx; python_version >'3.8'",
-    "sphinx-gallery; python_version >'3.8'",
-    "myst-parser; python_version >'3.8'",
-    "pillow; python_version >'3.8'",
-    "sphinx-autobuild; python_version >'3.8'",
-    "furo >=2024.5.6; python_version >'3.8'",
-    "sphinx-copybutton >=0.5.2; python_version >'3.8'",
-    "pdbr>=0.8.9; python_version >='3.8'",
+    "pytest-django >=4.8.0",
+    "Sphinx",
+    "sphinx-gallery",
+    "myst-parser",
+    "pillow",
+    "sphinx-autobuild",
+    "furo >=2024.5.6",
+    "sphinx-copybutton >=0.5.2",
+    "pdbr>=0.8.9",
 ]
 
 [build-system]

statemachine/io/__init__.py

@@ -1,12 +1,50 @@
+from typing import Any
+from typing import Callable
 from typing import Dict
+from typing import List
+from typing import Mapping
+from typing import TypedDict
+from typing import cast
 
 from ..factory import StateMachineMetaclass
 from ..state import State
 from ..statemachine import StateMachine
 from ..transition_list import TransitionList
 
+CallbacksType = str | Callable | List[str] | List[Callable]
 
-def create_machine_class_from_definition(name: str, **definition) -> StateMachine:  # noqa: C901
+
+class TransitionDict(TypedDict, total=False):
+    target: str
+    event: str
+    internal: bool
+    validators: bool
+    cond: CallbacksType
+    unless: CallbacksType
+    on: CallbacksType
+    before: CallbacksType
+    after: CallbacksType
+
+
+class StateDict(TypedDict, total=False):
+    name: str
+    value: Any
+    initial: bool
+    final: bool
+    enter: CallbacksType
+    exit: CallbacksType
+
+
+class StateWithTransitionsDict(StateDict, total=False):
+    on: Dict[str, List[TransitionDict]]
+
+
+StateOptions = StateDict | StateWithTransitionsDict
+
+
+def create_machine_class_from_definition(
+    name: str, states: Mapping[str, StateOptions], **definition
+) -> StateMachine:  # noqa: C901
     """
     Creates a StateMachine class from a dictionary definition, using the StateMachineMetaclass.
 
@@ -27,10 +65,10 @@ def create_machine_class_from_definition(name: str, **definition) -> StateMachin
     states_instances: Dict[str, State] = {}
     events_definitions: Dict[str, dict] = {}
 
-    for state_id, state_kwargs in definition.pop("states").items():
-        on_events = state_kwargs.pop("on", {})
-        if on_events:
-            events_definitions[state_id] = on_events
+    for state_id, state_kwargs in states.items():
+        transition_definitions = cast(StateWithTransitionsDict, state_kwargs).pop("on", {})
+        if transition_definitions:
+            events_definitions[state_id] = transition_definitions
 
         states_instances[state_id] = State(**state_kwargs)