@typecheck(CommandSent)
    def append_command(self, command_sent):
        # isinstance(command_sent, CommandSent)
        self.commands.append(command_sent)
        return len(self.commands) - 1
append_command(command_sent)
dataset/ETHPy150Open weblabdeusto/weblabdeusto/server/src/weblab/data/experiments.py/ExperimentUsage.append_command