def add_arg(self,arg, prepend=False):
self.args = [arg_.strip() for arg_ in self.args if arg_.strip()]<EOL>if arg.title() not in self.args:<EOL><INDENT>if prepend:<EOL><INDENT>self.args = [arg.title()] + self.args<EOL><DEDENT>else:<EOL><INDENT>self.args.append(arg.title())<EOL><DEDENT><DEDENT>
Append an arg to the arg list