def check_member_in(self, leaderboard_name, member):
return self.redis_connection.zscore(<EOL>leaderboard_name, member) is not None<EOL>
Check to see if a member exists in the named leaderboard.

@param leaderboard_name [String] Name of the leaderboard.
@param member [String] Member name.
@return +true+ if the member exists in the named leaderboard, +false+ otherwise.