<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_and_append(self, index):

 """Remove previous entrances of a tab, and add it as the latest."""

        while index in self:
            self.remove(index)
        self.append(index)