{"id":80776,"date":"2024-10-20T03:17:32","date_gmt":"2024-10-19T23:47:32","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/"},"modified":"2024-10-20T03:17:32","modified_gmt":"2024-10-19T23:47:32","slug":"stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/","title":{"rendered":"\u062a\u0648\u0642\u0641 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0632\u0646\u062c\u06cc\u0631\u0647 \u0647\u0627\u06cc \u0637\u0648\u0644\u0627\u0646\u06cc if-else: \u0627\u0632 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f"},"content":{"rendered":"<p>Summarize this content to 400 words in Persian Lang<br \/>\n            \u0622\u06cc\u0627 \u062a\u0627 \u0628\u0647 \u062d\u0627\u0644 \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0637\u0648\u0644\u0627\u0646\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u062f if-else \u06cc\u0627 \u0628\u0644\u0648\u06a9 \u0633\u0648\u0626\u06cc\u0686 \u0645\u0648\u0631\u062f \u062f\u0631 \u06a9\u062f \u0634\u0645\u0627\u061f \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0628\u0627 \u0648\u0631\u0648\u062f\u06cc \u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u060c \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u06cc\u0627 \u0645\u0646\u0637\u0642 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f \u0633\u0631\u0648\u06a9\u0627\u0631 \u062f\u0627\u0631\u06cc\u0645\u060c \u0627\u06cc\u0646 \u06a9\u0627\u0645\u0644\u0627\u064b \u0631\u0627\u06cc\u062c \u0627\u0633\u062a. \u0627\u0645\u0627 \u0628\u0627 \u06af\u0630\u0634\u062a \u0632\u0645\u0627\u0646\u060c \u0627\u06cc\u0646 \u0632\u0646\u062c\u06cc\u0631\u0647\u200c\u0647\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u062e\u0627\u0631\u062c \u0627\u0632 \u06a9\u0646\u062a\u0631\u0644 \u0631\u0634\u062f \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0647 \u06a9\u0627\u0628\u0648\u0633 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0634\u0648\u0646\u062f.<\/p>\n<p>\u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f.<\/p>\n<p>Command Pattern \u06cc\u06a9 \u0627\u0644\u06af\u0648\u06cc \u0637\u0631\u0627\u062d\u06cc \u0631\u0641\u062a\u0627\u0631\u06cc \u0627\u0633\u062a \u06a9\u0647 \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0647\u0627 \u0631\u0627 \u0628\u0647 \u0627\u0634\u06cc\u0627 \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0628\u0647 \u0634\u0645\u0627 \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u0631\u0627 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u0631\u0648\u0634 \u0647\u0627 \u0631\u0627 \u0628\u0627 \u0627\u0639\u0645\u0627\u0644 \u067e\u0627\u0631\u0627\u0645\u062a\u0631\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0627\u062c\u0631\u0627 \u0631\u0627 \u0628\u0647 \u062a\u0627\u062e\u06cc\u0631 \u0628\u06cc\u0646\u062f\u0627\u0632\u06cc\u062f \u0648 \u0635\u0641 \u0647\u0627\u06cc\u06cc \u0627\u0632 \u0639\u0645\u0644\u06cc\u0627\u062a \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f. \u0628\u0647 \u062e\u0635\u0648\u0635 \u0632\u0645\u0627\u0646\u06cc \u0645\u0641\u06cc\u062f \u0627\u0633\u062a \u06a9\u0647 \u06a9\u062f \u0634\u0645\u0627 \u062f\u0627\u0631\u0627\u06cc \u0639\u0628\u0627\u0631\u0627\u062a \u0634\u0631\u0637\u06cc \u0632\u06cc\u0627\u062f\u06cc \u0628\u0627\u0634\u062f.<\/p>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0648\u0627\u0631\u062f \u0622\u0646 \u0634\u0648\u06cc\u0645 \u0648 \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u06a9\u062f \u062e\u0648\u062f \u0631\u0627 \u0627\u0635\u0644\u0627\u062d \u06a9\u0646\u06cc\u062f \u062a\u0627 \u067e\u0627\u06a9\u200c\u062a\u0631\u060c \u0642\u0627\u0628\u0644 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc\u200c\u062a\u0631 \u0648 \u06af\u0633\u062a\u0631\u0634 \u0622\u0646 \u0622\u0633\u0627\u0646\u200c\u062a\u0631 \u0628\u0627\u0634\u062f.<\/p>\n<p>  \u0628\u0644\u0648\u06a9 \u0633\u0646\u062a\u06cc if-else<\/p>\n<p>\u062a\u0635\u0648\u0631 \u06a9\u0646\u06cc\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u06cc \u062f\u0627\u0631\u06cc\u062f \u06a9\u0647 \u0639\u0645\u0644\u06cc\u0627\u062a \u0645\u062e\u062a\u0644\u0641\u06cc \u0645\u0627\u0646\u0646\u062f \u0628\u0627\u0632 \u06a9\u0631\u062f\u0646\u060c \u0630\u062e\u06cc\u0631\u0647 \u06cc\u0627 \u0686\u0627\u067e \u06cc\u06a9 \u0633\u0646\u062f \u0631\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc \u062f\u0647\u062f. \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0648\u0633\u0648\u0633\u0647 \u0634\u0648\u06cc\u062f \u06a9\u0647 \u0686\u06cc\u0632\u06cc \u0634\u0628\u06cc\u0647 \u0628\u0647 \u0627\u06cc\u0646 \u0628\u0646\u0648\u06cc\u0633\u06cc\u062f:<\/p>\n<p>def handle_command(command):<br \/>\n    if command == &#8220;open&#8221;:<br \/>\n        open_document()<br \/>\n    elif command == &#8220;save&#8221;:<br \/>\n        save_document()<br \/>\n    elif command == &#8220;print&#8221;:<br \/>\n        print_document()<br \/>\n    else:<br \/>\n        raise ValueError(&#8220;Unknown command&#8221;)<\/p>\n<p>def open_document():<br \/>\n    print(&#8220;Document opened&#8221;)<\/p>\n<p>def save_document():<br \/>\n    print(&#8220;Document saved&#8221;)<\/p>\n<p>def print_document():<br \/>\n    print(&#8220;Document printed&#8221;)<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u0627\u06cc\u0646 \u0628\u0647 \u062e\u0648\u0628\u06cc \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f\u060c \u0627\u0645\u0627 \u0628\u0627 \u0627\u0636\u0627\u0641\u0647 \u0634\u062f\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\u060c \u0628\u0644\u0648\u06a9 if-else \u0631\u0634\u062f \u0645\u06cc \u06a9\u0646\u062f \u0648 \u06a9\u062f \u0634\u0645\u0627 \u0631\u0627 \u062e\u0648\u0627\u0646\u0627\u062a\u0631 \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0622\u0646 \u0633\u062e\u062a \u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>Refactoring \u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646\u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646\u060c \u0645\u0627 \u0647\u0631 \u0639\u0645\u0644\u06cc\u0627\u062a (\u06cc\u0627 \u0641\u0631\u0645\u0627\u0646) \u0631\u0627 \u062f\u0631 \u06a9\u0644\u0627\u0633 \u062e\u0648\u062f\u0634 \u06a9\u067e\u0633\u0648\u0644\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0648 \u0637\u0631\u0627\u062d\u06cc \u062a\u0645\u06cc\u0632\u062a\u0631 \u0648 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u062a\u0631\u06cc \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u06cc\u0645.<\/p>\n<p>  \u0645\u0631\u062d\u0644\u0647 1: \u06cc\u06a9 \u0631\u0627\u0628\u0637 \u0641\u0631\u0645\u0627\u0646 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f<\/p>\n<p>\u0645\u0627 \u0628\u0627 \u062a\u0639\u0631\u06cc\u0641 \u06cc\u06a9 \u0631\u0627\u0628\u0637 \u062f\u0633\u062a\u0648\u0631\u06cc \u0633\u0627\u062f\u0647 (\u06cc\u0627 \u06a9\u0644\u0627\u0633 \u067e\u0627\u06cc\u0647 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646) \u0634\u0631\u0648\u0639 \u0645\u06cc \u06a9\u0646\u06cc\u0645:<\/p>\n<p>from abc import ABC, abstractmethod<\/p>\n<p>class Command(ABC):<br \/>\n    @abstractmethod<br \/>\n    def execute(self):<br \/>\n        pass<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u0647\u0631 \u0641\u0631\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062e\u0648\u0627\u0647\u062f \u0634\u062f execute() \u0631\u0648\u0634\u06cc \u06a9\u0647 \u062d\u0627\u0648\u06cc \u0645\u0646\u0637\u0642 \u0639\u0645\u0644\u06cc\u0627\u062a \u0627\u0633\u062a.<\/p>\n<p>  \u0645\u0631\u062d\u0644\u0647 2: \u0627\u062c\u0631\u0627\u06cc \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u062a\u0646<\/p>\n<p>\u0627\u06a9\u0646\u0648\u0646\u060c \u0628\u0631\u0627\u06cc \u0647\u0631 \u0639\u0645\u0644\u06cc\u0627\u062a\u060c \u06a9\u0644\u0627\u0633\u200c\u0647\u0627\u06cc \u0641\u0631\u0645\u0627\u0646 \u0645\u0634\u062e\u0635\u06cc \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0647\u0631 \u0641\u0631\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062e\u0648\u0627\u0647\u062f \u0634\u062f execute() \u0631\u0648\u0634\u06cc \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0648\u0638\u06cc\u0641\u0647 \u062e\u0627\u0635 \u062e\u0648\u062f<\/p>\n<p>class OpenCommand(Command):<br \/>\n    def execute(self):<br \/>\n        print(&#8220;Document opened&#8221;)<\/p>\n<p>class SaveCommand(Command):<br \/>\n    def execute(self):<br \/>\n        print(&#8220;Document saved&#8221;)<\/p>\n<p>class PrintCommand(Command):<br \/>\n    def execute(self):<br \/>\n        print(&#8220;Document printed&#8221;)<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>  \u0645\u0631\u062d\u0644\u0647 3: \u06cc\u06a9 \u0641\u0631\u0627\u062e\u0648\u0627\u0646 \u0641\u0631\u0645\u0627\u0646 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<\/p>\n<p>\u0628\u0639\u062f\u060c \u0645\u0627 \u0628\u0647 \u0686\u06cc\u0632\u06cc \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u06cc\u0645 \u062a\u0627 \u0627\u06cc\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0631\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u0641\u0631\u0627\u062e\u0648\u0627\u0646\u06cc \u06a9\u0646\u06cc\u0645. \u0628\u0647 \u062c\u0627\u06cc \u0637\u0648\u0644\u0627\u0646\u06cc if-else \u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u06cc\u06a9 \u062f\u06cc\u06a9\u0634\u0646\u0631\u06cc \u0628\u0631\u0627\u06cc \u0646\u06af\u0627\u0634\u062a \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u0647 \u06a9\u0644\u0627\u0633 \u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645.<\/p>\n<p>class CommandInvoker:<br \/>\n    def __init__(self):<br \/>\n        self.commands = {<br \/>\n            &#8220;open&#8221;: OpenCommand(),<br \/>\n            &#8220;save&#8221;: SaveCommand(),<br \/>\n            &#8220;print&#8221;: PrintCommand(),<br \/>\n        }<\/p>\n<p>    def handle_command(self, command):<br \/>\n        if command in self.commands:<br \/>\n            self.commands[command].execute()<br \/>\n        else:<br \/>\n            raise ValueError(&#8220;Unknown command&#8221;)<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062d\u0627\u0644\u0627\u060c \u0645\u0627 CommandInvoker \u06a9\u0644\u0627\u0633 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0645\u06a9\u0627\u0646 \u0645\u062a\u0645\u0631\u06a9\u0632 \u0628\u0631\u0627\u06cc \u06a9\u0646\u062a\u0631\u0644 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>  \u0645\u0631\u062d\u0644\u0647 4: \u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/p>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0627\u06cc\u0646 \u062f\u0631 \u0639\u0645\u0644 \u0686\u06af\u0648\u0646\u0647 \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<p>if __name__ == &#8220;__main__&#8221;:<br \/>\n    invoker = CommandInvoker()<\/p>\n<p>    invoker.handle_command(&#8220;open&#8221;)<br \/>\n    invoker.handle_command(&#8220;save&#8221;)<br \/>\n    invoker.handle_command(&#8220;print&#8221;)<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u0686\u0631\u0627 \u0627\u06cc\u0646 \u0628\u0647\u062a\u0631 \u0627\u0633\u062a<\/p>\n<p>\u0645\u0642\u06cc\u0627\u0633 \u067e\u0630\u06cc\u0631\u06cc: \u0627\u0641\u0632\u0648\u062f\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u062c\u062f\u06cc\u062f \u0628\u0647 \u0633\u0627\u062f\u06af\u06cc \u0627\u0641\u0632\u0648\u062f\u0646 \u06cc\u06a9 \u06a9\u0644\u0627\u0633 \u062c\u062f\u06cc\u062f \u0648 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0622\u0646 \u0627\u0633\u062a commands \u0641\u0631\u0647\u0646\u06af \u0644\u063a\u062a.<br \/>\n\u062c\u062f\u0627\u0633\u0627\u0632\u06cc \u0646\u06af\u0631\u0627\u0646\u06cc \u0647\u0627: \u0647\u0631 \u062f\u0633\u062a\u0648\u0631 \u0645\u0633\u0626\u0648\u0644 \u0631\u0641\u062a\u0627\u0631 \u062e\u0648\u062f \u0627\u0633\u062a \u0648 \u06a9\u062f \u0631\u0627 \u0645\u0627\u0698\u0648\u0644\u0627\u0631\u062a\u0631 \u0648 \u062f\u0631\u06a9 \u0622\u0646 \u0622\u0633\u0627\u0646 \u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.<br \/>\n\u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc: \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u062f\u0631 \u0635\u0641 \u0642\u0631\u0627\u0631 \u062f\u0627\u062f\u060c \u0628\u0647 \u062a\u0623\u062e\u06cc\u0631 \u0627\u0646\u062f\u0627\u062e\u062a \u0648 \u06cc\u0627 \u0628\u0647 \u0635\u0648\u0631\u062a \u0645\u0634\u0631\u0648\u0637 \u0628\u062f\u0648\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u0646\u0637\u0642 \u0627\u0635\u0644\u06cc \u0627\u062c\u0631\u0627 \u0634\u062f.<\/p>\n<p>  \u0646\u062a\u06cc\u062c\u0647 \u06af\u06cc\u0631\u06cc<\/p>\n<p>Command Pattern \u0627\u0628\u0632\u0627\u0631 \u0642\u062f\u0631\u062a\u0645\u0646\u062f\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0634\u0645\u0627 \u062f\u0631 \u062d\u0630\u0641 \u0632\u0646\u062c\u06cc\u0631\u0647 \u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 if-else \u0648 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u067e\u0627\u06cc\u06af\u0627\u0647 \u06a9\u062f \u0633\u0627\u0632\u0645\u0627\u0646 \u06cc\u0627\u0641\u062a\u0647 \u062a\u0631 \u0648 \u0642\u0627\u0628\u0644 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u06a9\u0645\u06a9 \u06a9\u0646\u062f. \u0627\u06cc\u0646 \u0628\u0647 \u0648\u06cc\u0698\u0647 \u062f\u0631 \u0633\u0646\u0627\u0631\u06cc\u0648\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0639\u0645\u0644\u06cc\u0627\u062a \u06cc\u0627 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0632\u06cc\u0627\u062f\u06cc \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u062f\u0627\u0631\u06cc\u062f \u0645\u0641\u06cc\u062f \u0627\u0633\u062a.<\/p>\n<p>\u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u062f\u0641\u0639\u0647 \u0628\u0639\u062f \u06a9\u0647 \u0645\u062a\u0648\u062c\u0647 \u0634\u062f\u06cc\u062f \u062f\u0631 \u062d\u0627\u0644 \u0646\u0648\u0634\u062a\u0646 \u06cc\u06a9 \u0628\u0644\u0648\u06a9 \u0634\u0631\u0637\u06cc \u063a\u0648\u0644\u200c\u067e\u06cc\u06a9\u0631 \u0647\u0633\u062a\u06cc\u062f\u060c \u06a9\u062f \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646 \u0645\u062c\u062f\u062f\u0627\u064b \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u062f!<\/p>\n<p>\u06a9\u062f \u0646\u0648\u06cc\u0633\u06cc \u0645\u0628\u0627\u0631\u06a9!<\/p>\n<div data-article-id=\"2045058\" id=\"article-body\">\n<p>\u0622\u06cc\u0627 \u062a\u0627 \u0628\u0647 \u062d\u0627\u0644 \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0637\u0648\u0644\u0627\u0646\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u062f <code>if-else<\/code> \u06cc\u0627 \u0628\u0644\u0648\u06a9 \u0633\u0648\u0626\u06cc\u0686 \u0645\u0648\u0631\u062f \u062f\u0631 \u06a9\u062f \u0634\u0645\u0627\u061f \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0628\u0627 \u0648\u0631\u0648\u062f\u06cc \u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u060c \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u06cc\u0627 \u0645\u0646\u0637\u0642 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f \u0633\u0631\u0648\u06a9\u0627\u0631 \u062f\u0627\u0631\u06cc\u0645\u060c \u0627\u06cc\u0646 \u06a9\u0627\u0645\u0644\u0627\u064b \u0631\u0627\u06cc\u062c \u0627\u0633\u062a. \u0627\u0645\u0627 \u0628\u0627 \u06af\u0630\u0634\u062a \u0632\u0645\u0627\u0646\u060c \u0627\u06cc\u0646 \u0632\u0646\u062c\u06cc\u0631\u0647\u200c\u0647\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u062e\u0627\u0631\u062c \u0627\u0632 \u06a9\u0646\u062a\u0631\u0644 \u0631\u0634\u062f \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0647 \u06a9\u0627\u0628\u0648\u0633 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0634\u0648\u0646\u062f.<\/p>\n<p>\u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f.<\/p>\n<p>Command Pattern \u06cc\u06a9 \u0627\u0644\u06af\u0648\u06cc \u0637\u0631\u0627\u062d\u06cc \u0631\u0641\u062a\u0627\u0631\u06cc \u0627\u0633\u062a \u06a9\u0647 \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0647\u0627 \u0631\u0627 \u0628\u0647 \u0627\u0634\u06cc\u0627 \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0628\u0647 \u0634\u0645\u0627 \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u0631\u0627 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u0631\u0648\u0634 \u0647\u0627 \u0631\u0627 \u0628\u0627 \u0627\u0639\u0645\u0627\u0644 \u067e\u0627\u0631\u0627\u0645\u062a\u0631\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0627\u062c\u0631\u0627 \u0631\u0627 \u0628\u0647 \u062a\u0627\u062e\u06cc\u0631 \u0628\u06cc\u0646\u062f\u0627\u0632\u06cc\u062f \u0648 \u0635\u0641 \u0647\u0627\u06cc\u06cc \u0627\u0632 \u0639\u0645\u0644\u06cc\u0627\u062a \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f. \u0628\u0647 \u062e\u0635\u0648\u0635 \u0632\u0645\u0627\u0646\u06cc \u0645\u0641\u06cc\u062f \u0627\u0633\u062a \u06a9\u0647 \u06a9\u062f \u0634\u0645\u0627 \u062f\u0627\u0631\u0627\u06cc \u0639\u0628\u0627\u0631\u0627\u062a \u0634\u0631\u0637\u06cc \u0632\u06cc\u0627\u062f\u06cc \u0628\u0627\u0634\u062f.<\/p>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0648\u0627\u0631\u062f \u0622\u0646 \u0634\u0648\u06cc\u0645 \u0648 \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u06a9\u062f \u062e\u0648\u062f \u0631\u0627 \u0627\u0635\u0644\u0627\u062d \u06a9\u0646\u06cc\u062f \u062a\u0627 \u067e\u0627\u06a9\u200c\u062a\u0631\u060c \u0642\u0627\u0628\u0644 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc\u200c\u062a\u0631 \u0648 \u06af\u0633\u062a\u0631\u0634 \u0622\u0646 \u0622\u0633\u0627\u0646\u200c\u062a\u0631 \u0628\u0627\u0634\u062f.<\/p>\n<p><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D8%A8%D9%84%D9%88%DA%A9_%D8%B3%D9%86%D8%AA%DB%8C_if-else\" >\u0628\u0644\u0648\u06a9 \u0633\u0646\u062a\u06cc if-else<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D9%85%D8%B1%D8%AD%D9%84%D9%87_1_%DB%8C%DA%A9_%D8%B1%D8%A7%D8%A8%D8%B7_%D9%81%D8%B1%D9%85%D8%A7%D9%86_%D8%AA%D8%B9%D8%B1%DB%8C%D9%81_%DA%A9%D9%86%DB%8C%D8%AF\" >\u0645\u0631\u062d\u0644\u0647 1: \u06cc\u06a9 \u0631\u0627\u0628\u0637 \u0641\u0631\u0645\u0627\u0646 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D9%85%D8%B1%D8%AD%D9%84%D9%87_2_%D8%A7%D8%AC%D8%B1%D8%A7%DB%8C_%D8%AF%D8%B3%D8%AA%D9%88%D8%B1%D8%A7%D8%AA_%D8%A8%D8%AA%D9%86\" >\u0645\u0631\u062d\u0644\u0647 2: \u0627\u062c\u0631\u0627\u06cc \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u062a\u0646<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D9%85%D8%B1%D8%AD%D9%84%D9%87_3_%DB%8C%DA%A9_%D9%81%D8%B1%D8%A7%D8%AE%D9%88%D8%A7%D9%86_%D9%81%D8%B1%D9%85%D8%A7%D9%86_%D8%A7%DB%8C%D8%AC%D8%A7%D8%AF_%DA%A9%D9%86%DB%8C%D8%AF\" >\u0645\u0631\u062d\u0644\u0647 3: \u06cc\u06a9 \u0641\u0631\u0627\u062e\u0648\u0627\u0646 \u0641\u0631\u0645\u0627\u0646 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D9%85%D8%B1%D8%AD%D9%84%D9%87_4_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87\" >\u0645\u0631\u062d\u0644\u0647 4: \u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nabfollower.com\/blog\/stop-using-long-if-else-chains-use-the-command-pattern-in-python-23ci\/#%D9%86%D8%AA%DB%8C%D8%AC%D9%87_%DA%AF%DB%8C%D8%B1%DB%8C\" >\u0646\u062a\u06cc\u062c\u0647 \u06af\u06cc\u0631\u06cc<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D8%A8%D9%84%D9%88%DA%A9_%D8%B3%D9%86%D8%AA%DB%8C_if-else\"><\/span>\n<p>  \u0628\u0644\u0648\u06a9 \u0633\u0646\u062a\u06cc if-else<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062a\u0635\u0648\u0631 \u06a9\u0646\u06cc\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u06cc \u062f\u0627\u0631\u06cc\u062f \u06a9\u0647 \u0639\u0645\u0644\u06cc\u0627\u062a \u0645\u062e\u062a\u0644\u0641\u06cc \u0645\u0627\u0646\u0646\u062f \u0628\u0627\u0632 \u06a9\u0631\u062f\u0646\u060c \u0630\u062e\u06cc\u0631\u0647 \u06cc\u0627 \u0686\u0627\u067e \u06cc\u06a9 \u0633\u0646\u062f \u0631\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc \u062f\u0647\u062f. \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0648\u0633\u0648\u0633\u0647 \u0634\u0648\u06cc\u062f \u06a9\u0647 \u0686\u06cc\u0632\u06cc \u0634\u0628\u06cc\u0647 \u0628\u0647 \u0627\u06cc\u0646 \u0628\u0646\u0648\u06cc\u0633\u06cc\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>def handle_command(command):\n    if command == \"open\":\n        open_document()\n    elif command == \"save\":\n        save_document()\n    elif command == \"print\":\n        print_document()\n    else:\n        raise ValueError(\"Unknown command\")\n\ndef open_document():\n    print(\"Document opened\")\n\ndef save_document():\n    print(\"Document saved\")\n\ndef print_document():\n    print(\"Document printed\")\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0628\u0647 \u062e\u0648\u0628\u06cc \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f\u060c \u0627\u0645\u0627 \u0628\u0627 \u0627\u0636\u0627\u0641\u0647 \u0634\u062f\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\u060c \u0628\u0644\u0648\u06a9 if-else \u0631\u0634\u062f \u0645\u06cc \u06a9\u0646\u062f \u0648 \u06a9\u062f \u0634\u0645\u0627 \u0631\u0627 \u062e\u0648\u0627\u0646\u0627\u062a\u0631 \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0622\u0646 \u0633\u062e\u062a \u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p><strong>Refactoring \u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646<\/strong><br \/>\u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646\u060c \u0645\u0627 \u0647\u0631 \u0639\u0645\u0644\u06cc\u0627\u062a (\u06cc\u0627 \u0641\u0631\u0645\u0627\u0646) \u0631\u0627 \u062f\u0631 \u06a9\u0644\u0627\u0633 \u062e\u0648\u062f\u0634 \u06a9\u067e\u0633\u0648\u0644\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0648 \u0637\u0631\u0627\u062d\u06cc \u062a\u0645\u06cc\u0632\u062a\u0631 \u0648 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u062a\u0631\u06cc \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u06cc\u0645.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%B1%D8%AD%D9%84%D9%87_1_%DB%8C%DA%A9_%D8%B1%D8%A7%D8%A8%D8%B7_%D9%81%D8%B1%D9%85%D8%A7%D9%86_%D8%AA%D8%B9%D8%B1%DB%8C%D9%81_%DA%A9%D9%86%DB%8C%D8%AF\"><\/span>\n<p>  \u0645\u0631\u062d\u0644\u0647 1: \u06cc\u06a9 \u0631\u0627\u0628\u0637 \u0641\u0631\u0645\u0627\u0646 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u0627 \u0628\u0627 \u062a\u0639\u0631\u06cc\u0641 \u06cc\u06a9 \u0631\u0627\u0628\u0637 \u062f\u0633\u062a\u0648\u0631\u06cc \u0633\u0627\u062f\u0647 (\u06cc\u0627 \u06a9\u0644\u0627\u0633 \u067e\u0627\u06cc\u0647 \u062f\u0631 \u067e\u0627\u06cc\u062a\u0648\u0646) \u0634\u0631\u0648\u0639 \u0645\u06cc \u06a9\u0646\u06cc\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>from abc import ABC, abstractmethod\n\nclass Command(ABC):\n    @abstractmethod\n    def execute(self):\n        pass\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0647\u0631 \u0641\u0631\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062e\u0648\u0627\u0647\u062f \u0634\u062f <code>execute()<\/code> \u0631\u0648\u0634\u06cc \u06a9\u0647 \u062d\u0627\u0648\u06cc \u0645\u0646\u0637\u0642 \u0639\u0645\u0644\u06cc\u0627\u062a \u0627\u0633\u062a.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%B1%D8%AD%D9%84%D9%87_2_%D8%A7%D8%AC%D8%B1%D8%A7%DB%8C_%D8%AF%D8%B3%D8%AA%D9%88%D8%B1%D8%A7%D8%AA_%D8%A8%D8%AA%D9%86\"><\/span>\n<p>  \u0645\u0631\u062d\u0644\u0647 2: \u0627\u062c\u0631\u0627\u06cc \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u062a\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0627\u06a9\u0646\u0648\u0646\u060c \u0628\u0631\u0627\u06cc \u0647\u0631 \u0639\u0645\u0644\u06cc\u0627\u062a\u060c \u06a9\u0644\u0627\u0633\u200c\u0647\u0627\u06cc \u0641\u0631\u0645\u0627\u0646 \u0645\u0634\u062e\u0635\u06cc \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0647\u0631 \u0641\u0631\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062e\u0648\u0627\u0647\u062f \u0634\u062f <code>execute()<\/code> \u0631\u0648\u0634\u06cc \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0648\u0638\u06cc\u0641\u0647 \u062e\u0627\u0635 \u062e\u0648\u062f<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>class OpenCommand(Command):\n    def execute(self):\n        print(\"Document opened\")\n\nclass SaveCommand(Command):\n    def execute(self):\n        print(\"Document saved\")\n\nclass PrintCommand(Command):\n    def execute(self):\n        print(\"Document printed\")\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%B1%D8%AD%D9%84%D9%87_3_%DB%8C%DA%A9_%D9%81%D8%B1%D8%A7%D8%AE%D9%88%D8%A7%D9%86_%D9%81%D8%B1%D9%85%D8%A7%D9%86_%D8%A7%DB%8C%D8%AC%D8%A7%D8%AF_%DA%A9%D9%86%DB%8C%D8%AF\"><\/span>\n<p>  \u0645\u0631\u062d\u0644\u0647 3: \u06cc\u06a9 \u0641\u0631\u0627\u062e\u0648\u0627\u0646 \u0641\u0631\u0645\u0627\u0646 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u0639\u062f\u060c \u0645\u0627 \u0628\u0647 \u0686\u06cc\u0632\u06cc \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u06cc\u0645 \u062a\u0627 \u0627\u06cc\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0631\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u0641\u0631\u0627\u062e\u0648\u0627\u0646\u06cc \u06a9\u0646\u06cc\u0645. \u0628\u0647 \u062c\u0627\u06cc \u0637\u0648\u0644\u0627\u0646\u06cc <code>if-else<\/code> \u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u06cc\u06a9 \u062f\u06cc\u06a9\u0634\u0646\u0631\u06cc \u0628\u0631\u0627\u06cc \u0646\u06af\u0627\u0634\u062a \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0628\u0647 \u06a9\u0644\u0627\u0633 \u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>class CommandInvoker:\n    def __init__(self):\n        self.commands = {\n            \"open\": OpenCommand(),\n            \"save\": SaveCommand(),\n            \"print\": PrintCommand(),\n        }\n\n    def handle_command(self, command):\n        if command in self.commands:\n            self.commands[command].execute()\n        else:\n            raise ValueError(\"Unknown command\")\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062d\u0627\u0644\u0627\u060c \u0645\u0627 <code>CommandInvoker<\/code> \u06a9\u0644\u0627\u0633 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0645\u06a9\u0627\u0646 \u0645\u062a\u0645\u0631\u06a9\u0632 \u0628\u0631\u0627\u06cc \u06a9\u0646\u062a\u0631\u0644 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%B1%D8%AD%D9%84%D9%87_4_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87\"><\/span>\n<p>  \u0645\u0631\u062d\u0644\u0647 4: \u0627\u0633\u062a\u0641\u0627\u062f\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0627\u06cc\u0646 \u062f\u0631 \u0639\u0645\u0644 \u0686\u06af\u0648\u0646\u0647 \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>if __name__ == \"__main__\":\n    invoker = CommandInvoker()\n\n    invoker.handle_command(\"open\")\n    invoker.handle_command(\"save\")\n    invoker.handle_command(\"print\")\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>\u0686\u0631\u0627 \u0627\u06cc\u0646 \u0628\u0647\u062a\u0631 \u0627\u0633\u062a<\/strong><\/p>\n<ul>\n<li>\n<p>\u0645\u0642\u06cc\u0627\u0633 \u067e\u0630\u06cc\u0631\u06cc: \u0627\u0641\u0632\u0648\u062f\u0646 \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u062c\u062f\u06cc\u062f \u0628\u0647 \u0633\u0627\u062f\u06af\u06cc \u0627\u0641\u0632\u0648\u062f\u0646 \u06cc\u06a9 \u06a9\u0644\u0627\u0633 \u062c\u062f\u06cc\u062f \u0648 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0622\u0646 \u0627\u0633\u062a <code>commands<\/code> \u0641\u0631\u0647\u0646\u06af \u0644\u063a\u062a.<\/p>\n<\/li>\n<li>\n<p>\u062c\u062f\u0627\u0633\u0627\u0632\u06cc \u0646\u06af\u0631\u0627\u0646\u06cc \u0647\u0627: \u0647\u0631 \u062f\u0633\u062a\u0648\u0631 \u0645\u0633\u0626\u0648\u0644 \u0631\u0641\u062a\u0627\u0631 \u062e\u0648\u062f \u0627\u0633\u062a \u0648 \u06a9\u062f \u0631\u0627 \u0645\u0627\u0698\u0648\u0644\u0627\u0631\u062a\u0631 \u0648 \u062f\u0631\u06a9 \u0622\u0646 \u0622\u0633\u0627\u0646 \u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<\/li>\n<li>\n<p>\u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc: \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u062f\u0631 \u0635\u0641 \u0642\u0631\u0627\u0631 \u062f\u0627\u062f\u060c \u0628\u0647 \u062a\u0623\u062e\u06cc\u0631 \u0627\u0646\u062f\u0627\u062e\u062a \u0648 \u06cc\u0627 \u0628\u0647 \u0635\u0648\u0631\u062a \u0645\u0634\u0631\u0648\u0637 \u0628\u062f\u0648\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u0646\u0637\u0642 \u0627\u0635\u0644\u06cc \u0627\u062c\u0631\u0627 \u0634\u062f.<\/p>\n<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"%D9%86%D8%AA%DB%8C%D8%AC%D9%87_%DA%AF%DB%8C%D8%B1%DB%8C\"><\/span>\n<p>  \u0646\u062a\u06cc\u062c\u0647 \u06af\u06cc\u0631\u06cc<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Command Pattern \u0627\u0628\u0632\u0627\u0631 \u0642\u062f\u0631\u062a\u0645\u0646\u062f\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0634\u0645\u0627 \u062f\u0631 \u062d\u0630\u0641 \u0632\u0646\u062c\u06cc\u0631\u0647 \u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 if-else \u0648 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u067e\u0627\u06cc\u06af\u0627\u0647 \u06a9\u062f \u0633\u0627\u0632\u0645\u0627\u0646 \u06cc\u0627\u0641\u062a\u0647 \u062a\u0631 \u0648 \u0642\u0627\u0628\u0644 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u06a9\u0645\u06a9 \u06a9\u0646\u062f. \u0627\u06cc\u0646 \u0628\u0647 \u0648\u06cc\u0698\u0647 \u062f\u0631 \u0633\u0646\u0627\u0631\u06cc\u0648\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0639\u0645\u0644\u06cc\u0627\u062a \u06cc\u0627 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0632\u06cc\u0627\u062f\u06cc \u0628\u0631 \u0627\u0633\u0627\u0633 \u0648\u0631\u0648\u062f\u06cc \u06a9\u0627\u0631\u0628\u0631 \u062f\u0627\u0631\u06cc\u062f \u0645\u0641\u06cc\u062f \u0627\u0633\u062a.<\/p>\n<p>\u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u062f\u0641\u0639\u0647 \u0628\u0639\u062f \u06a9\u0647 \u0645\u062a\u0648\u062c\u0647 \u0634\u062f\u06cc\u062f \u062f\u0631 \u062d\u0627\u0644 \u0646\u0648\u0634\u062a\u0646 \u06cc\u06a9 \u0628\u0644\u0648\u06a9 \u0634\u0631\u0637\u06cc \u063a\u0648\u0644\u200c\u067e\u06cc\u06a9\u0631 \u0647\u0633\u062a\u06cc\u062f\u060c \u06a9\u062f \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0627\u0644\u06af\u0648\u06cc \u0641\u0631\u0645\u0627\u0646 \u0645\u062c\u062f\u062f\u0627\u064b \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u062f!<\/p>\n<p>\u06a9\u062f \u0646\u0648\u06cc\u0633\u06cc \u0645\u0628\u0627\u0631\u06a9!<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summarize this content to 400 words in Persian Lang \u0622\u06cc\u0627 \u062a\u0627 \u0628\u0647 \u062d\u0627\u0644 \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0637\u0648\u0644\u0627\u0646\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u062f if-else \u06cc\u0627 \u0628\u0644\u0648\u06a9 \u0633\u0648\u0626\u06cc\u0686 \u0645\u0648\u0631\u062f \u062f\u0631 \u06a9\u062f \u0634\u0645\u0627\u061f \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0628\u0627 \u0648\u0631\u0648\u062f\u06cc \u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u060c \u062f\u0633\u062a\u0648\u0631\u0627\u062a \u06cc\u0627 \u0645\u0646\u0637\u0642 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f \u0633\u0631\u0648\u06a9\u0627\u0631 \u062f\u0627\u0631\u06cc\u0645\u060c \u0627\u06cc\u0646 \u06a9\u0627\u0645\u0644\u0627\u064b \u0631\u0627\u06cc\u062c \u0627\u0633\u062a. \u0627\u0645\u0627 \u0628\u0627 \u06af\u0630\u0634\u062a \u0632\u0645\u0627\u0646\u060c \u0627\u06cc\u0646 \u0632\u0646\u062c\u06cc\u0631\u0647\u200c\u0647\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u062e\u0627\u0631\u062c \u0627\u0632 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":80777,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-80776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/80776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=80776"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/80776\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/80777"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=80776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=80776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=80776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}