Update command/command_handler.py

command/command_handler.py

@@ -0,0 +1,14 @@
+from typing import Optional
+from abc import ABC, abstractmethod
+
+class CommandHandler(ABC):
+    def __init__(self, successor: Optional["CommandHandler"] = None):
+        self.successor = successor
+
+    def handle_command(self, command):
+        if self.successor:
+            self.successor.handle_command(command)
+
+    @abstractmethod
+    def execute_command(self):
+        """Method of processing command execution logic"""