<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def helper(*commands):
 """Decorate a function to be the helper function of commands. Arguments: commands: Names of command that should trigger this function object. Interface of helper methods: @helper('some-command') def help_foo(self, args):
 ''' Arguments: args: A list of arguments. Returns: A string that is the help message. ''' pass """

    def decorated_func(f):
        f.__help_targets__ = list(commands)
        return f
    return decorated_func