commit_new

.gitignore

@@ -3,6 +3,9 @@ __pycache__/
 *.py[cod]
 *$py.class
 
+#visual studio
+.vs/
+
 # C extensions
 *.so
 

controls/device.py

@@ -2,8 +2,13 @@ from dataclasses import dataclass
 from typing import Optional, Collection, Any
 from abc import abstractmethod
 
-class DeviceLifecycleState:
-    pass  # TODO(Homework #3)
+from enum import IntEnum
+from abc import ABC, abstractmethod
+
+class DeviceLifecycleState(IntEnum):
+    INIT = 0
+    OPEN = 1
+    CLOSE = 2
 
 
 class DevaceError(Exception):
@@ -33,8 +38,8 @@ class ActionDescriptor:
     info: Optional[str] = None
 
 
-class Device:
-    # TODO(Homework #3)
+class Device(ABC):
+    
     _state = DeviceLifecycleState.INIT
 
     @property
@@ -44,9 +49,13 @@ class Device:
     def close(self):
         self._state = DeviceLifecycleState.CLOSE
         
+    @property
+    @abstractmethod
     def trait_descriptors(self) -> Collection[TraitDescriptor]:
         pass
     
+    @property
+    @abstractmethod
     def action_descriptors(self) -> Collection[ActionDescriptor]:
         pass