def _member_data_key(self, leaderboard_name):
if self.global_member_data is False:<EOL><INDENT>return '<STR_LIT>' % (leaderboard_name, self.member_data_namespace)<EOL><DEDENT>else:<EOL><INDENT>return self.member_data_namespace<EOL><DEDENT>
Key for retrieving optional member data.

@param leaderboard_name [String] Name of the leaderboard.
@return a key in the form of +leaderboard_name:member_data+