HELP with code. Please

How do I allow the @ symbol to be written in that case?:

        suggestions = [cmd for cmd in command_list.keys() if prefix.lower() in cmd.lower()]
        formatted_suggestions = "\n".join(f"{' ' * 60}| {cmd} |" for cmd in suggestions)
        user_input = prompt(f"Please enter your command: ", completer=WordCompleter(suggestions, ignore_case=True, splitter=None))