diff --git a/controls/__init__.py b/controls/__init__.py
index 35e48d4..5458f05 100644
--- a/controls/__init__.py
+++ b/controls/__init__.py
@@ -1,4 +1,4 @@
-***
+"""
 SCADA (Supervisory Control And Data Acquisition)
 
 SCADA-системы нужны для организации сбора данных в реальном времени, 
@@ -11,4 +11,4 @@ SCADA-системы решают следующие задачи:
 Ведение базы данных с технологической информацией.
 Аварийная сигнализация и управление служебными сообщениями о неполадках.
 Подготовка и генерирование отчетов о ходе технологического процесса.
-***
+"""
diff --git a/equipment/device.py b/equipment/device.py
index ea4739a..26f4820 100644
--- a/equipment/device.py
+++ b/equipment/device.py
@@ -1,7 +1,6 @@
 from dataclasses import dataclass
 from typing import Optional, Collection, Any
 from abc import ABC, abstractmethod
-
 from enum import IntEnum
 
 class DeviceLifecycleState(IntEnum):
@@ -58,7 +57,7 @@ class Device(ABC):
     def action_descriptors(self) -> Collection[ActionDescriptor]:
         pass
 
-    #@abstractmethod
+    @abstractmethod
     def __getitem__(self, trait_name: str) -> Optional[Any]:
         """Return logical state of trait `trait_name`."""
         pass
diff --git a/equipment/turtle_device.py b/equipment/turtle_device.py
index b25aef7..8870ec8 100644
--- a/equipment/turtle_device.py
+++ b/equipment/turtle_device.py
@@ -1,18 +1,18 @@
+import time
 from turtle import Turtle
-from typing import Any
 from equipment.device import SynchronyDevice
+from equipment.device import Device
 import inspect
-import types
+from typing import Optional, Collection, Any
 
 class TurtleDevice(SynchronyDevice):
     def open(self):
         super().open()
-        return Turtle()
+        self.turtle = Turtle()
 
-    @staticmethod
-    def close (exam):
+    def close (self):
         super().close()
-        del exam
+        del self.turtle
         
     @property
     def trait_descriptors(self):
@@ -43,20 +43,35 @@ class TurtleDevice(SynchronyDevice):
 
     def execute(self, action_name: str, *args, **kwargs):
         """Execute action `action_name`, using `args` and `kwargs` as action argument."""
-        pass
+        if self.state == 1:
+            f = getattr(self.turtle, action_name)
+            f(int(*args), **kwargs)
+        else:
+            print("It's not opened")
+            self.open()
+            #time.sleep(30)
+            f = getattr(self.turtle, action_name)
+            f(int(*args), **kwargs)
 
     def read(self, trait_name: str):
         """Read physical state of trait `trait_name` from device."""
-        pass
+        return getattr(self.turtle, trait_name)
 
     def write(self, trait_name: str, value: Any) -> bool:
         """Pass `value` to trait `trait_name` of device."""
-        pass
+        setattr(self.turtle, trait_name, value)
 
     def invalidate(self, trait_name: str):
         """Invalidate logical state of trait `trait_name`"""
-        pass
+        if self.read(trait_name) == self.__getitem__(trait_name):
+            print("Everything's okey")
+        else:
+            print(f"Something went wrong with {trait_name}.")
 
+    def __getitem__(self, trait_name: str) -> Optional[Any]:
+        """Return logical state of trait `trait_name`."""
+        return getattr(self, trait_name)
 
+#print(inspect.getmembers(Turtle))
 #t = TurtleDevice()
-#print(t.trait_descriptors)
+#print(t.execute("forward", 3))
diff --git a/noblocking_turtle_shell.py b/noblocking_turtle_shell.py
index 34e2302..1e13129 100644
--- a/noblocking_turtle_shell.py
+++ b/noblocking_turtle_shell.py
@@ -2,6 +2,7 @@ import cmd
 import threading
 from threading import Thread
 from threading import Event
+import argparse
 import time
 
 from queue import Queue
@@ -15,8 +16,10 @@ class TurtleDeviceThread(threading.Thread):
     def __message_processing__(self):
         while True:
             new_message = self.queue.get()
-            print("Name and args of action are {}".format(new_message))
-            #self.device.
+            #print(type(new_message))
+            #print(new_message)
+            #print("Name and args of action are {}".format(new_message))
+            self.device.execute(*new_message)
             #time.sleep(30)
             self.queue.task_done()
             if self.event.is_set():
@@ -46,7 +49,7 @@ class NoBlockingTurtleShell(cmd.Cmd):
 
     def do_execute(self, arg):
         # TODO(Homework 4) \begin
-        turtle_thread.queue.put(arg)
+        turtle_thread.queue.put(parse(arg))
         # TODO(Homework 4) \end
 
     def do_exit(self, arg):
@@ -54,7 +57,9 @@ class NoBlockingTurtleShell(cmd.Cmd):
         turtle_thread.event.set()
         # TODO(Homework 4) \end
 
-
+def parse(arg):
+    'Convert a series of zero or more numbers to an argument tuple'
+    return tuple(arg.split())
 
 if __name__ == '__main__':
     turtle_thread = TurtleDeviceThread()
diff --git a/turtle_shell.py b/turtle_shell.py
index ac22aab..20464cf 100644
--- a/turtle_shell.py
+++ b/turtle_shell.py
@@ -10,6 +10,7 @@ class TurtleShell(cmd.Cmd):
     # ----- basic turtle commands -----
     def do_forward(self, arg):
         'Move the turtle forward by the specified distance:  FORWARD 10'
+
         forward(*parse(arg))
     def do_right(self, arg):
         'Turn turtle right by given number of degrees:  RIGHT 20'