code: def read_single(db, collection, match_params=None):
          
          return db[collection].find_one(match_params if match_params else {}, {'_id': False})
docs: Wrapper for pymongo.find_one()
          :param db: db connection
          :param collection: collection to read data from
          :param match_params: a query that matches the documents to select
          :return: document ('_id' is excluded from result)