redis/_parsers/commands.py [118:145]:
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        elif "pubsub" in command["flags"] or command["name"] == "pubsub":
            keys = self._get_pubsub_keys(*args)
        else:
            if (
                command["step_count"] == 0
                and command["first_key_pos"] == 0
                and command["last_key_pos"] == 0
            ):
                is_subcmd = False
                if "subcommands" in command:
                    subcmd_name = f"{cmd_name}|{args[1].lower()}"
                    for subcmd in command["subcommands"]:
                        if str_if_bytes(subcmd[0]) == subcmd_name:
                            command = self.parse_subcommand(subcmd)
                            is_subcmd = True

                # The command doesn't have keys in it
                if not is_subcmd:
                    return None
            last_key_pos = command["last_key_pos"]
            if last_key_pos < 0:
                last_key_pos = len(args) - abs(last_key_pos)
            keys_pos = list(
                range(command["first_key_pos"], last_key_pos + 1, command["step_count"])
            )
            keys = [args[pos] for pos in keys_pos]

        return keys
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redis/_parsers/commands.py [240:267]:
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        elif "pubsub" in command["flags"] or command["name"] == "pubsub":
            keys = self._get_pubsub_keys(*args)
        else:
            if (
                command["step_count"] == 0
                and command["first_key_pos"] == 0
                and command["last_key_pos"] == 0
            ):
                is_subcmd = False
                if "subcommands" in command:
                    subcmd_name = f"{cmd_name}|{args[1].lower()}"
                    for subcmd in command["subcommands"]:
                        if str_if_bytes(subcmd[0]) == subcmd_name:
                            command = self.parse_subcommand(subcmd)
                            is_subcmd = True

                # The command doesn't have keys in it
                if not is_subcmd:
                    return None
            last_key_pos = command["last_key_pos"]
            if last_key_pos < 0:
                last_key_pos = len(args) - abs(last_key_pos)
            keys_pos = list(
                range(command["first_key_pos"], last_key_pos + 1, command["step_count"])
            )
            keys = [args[pos] for pos in keys_pos]

        return keys
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