<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def update_member_data(self, member, member_data):
        '''
        Update the optional member data for a given member in the leaderboard.

        @param member [String] Member name.
        @param member_data [String] Optional member data.
        '''
        self.update_member_data_in(self.leaderboard_name, member, member_data)