style: format Python files with Ruff

tests/test_todocreate.py

@@ -8,19 +8,23 @@ def test_todocreate_requires_task() -> None:
     with pytest.raises(ValidationError):
         todocreate()
 
+
 def test_todocreate_accepts_valid_task() -> None:
-    todo_data = todocreate(task = "学习测试单元")
-    
+    todo_data = todocreate(task="学习测试单元")
+
     assert todo_data.task == "学习测试单元"
 
+
 def test_todocreate_rejects_empty_task() -> None:
     with pytest.raises(ValidationError):
         todocreate(task="")
 
+
 def test_todocreate_rejects_blank_task() -> None:
     with pytest.raises(ValidationError):
         todocreate(task="   ")
 
+
 def test_todocreate_rejects_task_longer_than_200_characters() -> None:
     long_task = "a" * 201