<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_arg(self, arg):
 """Remove an arg to the arg list"""


        self.args = [arg_.strip() for arg_ in self.args if arg_.strip()]

        for arg_ in list(self.args):
            if arg_.lower() == arg.lower():
                self.args.remove(arg_)