old_contents: from os import getenv
  
  from pymongo import Connection
  
  from bamboo.config import settings
  
  
  class Database(object):
      """Container for the mongo db connection."""
  
      # mongodb connection default host and port
      _connection = Connection()
      _db = None
  
      @classmethod
      def create_db(cls, db_name):
          """Create a database `db_name` under the `_connection`.
  
          :param cls: The class to set a connection on.
          :param db_name: The name of the collection to create.
          """
          cls._db = cls._connection[db_name]
  
      @classmethod
      def connection(cls):
          """Return the database `_connection`."""
          return cls._connection
  
      @classmethod
      def db(cls, name=None):
          """Create the database if it has not been created.
  
          :param cls: The class to set the database for.
          :param name: The name of the database to create.
          :returns: The created database.
          """
          if not cls._db and name:
              cls.create_db(name or settings.DATABASE_NAME)
          return cls._db
  
new_contents: from os import getenv
  
  from pymongo import Connection
  
  from bamboo.config import settings
  
  
  class Database(object):
      """Container for the mongo db connection."""
  
      # mongodb connection default host and port
      _connection = Connection()
      _db = None
  
      @classmethod
      def create_db(cls, db_name):
          """Create a database `db_name` under the `_connection`.
  
          :param cls: The class to set a connection on.
          :param db_name: The name of the collection to create.
          """
          cls._db = cls._connection[db_name]
  
      @classmethod
      def connection(cls):
          """Return the database `_connection`."""
          return cls._connection
  
      @classmethod
      def db(cls, name=None):
          """Create the database if it has not been created.
  
          :param cls: The class to set the database for.
          :param name: The name of the database to create.
          :returns: The created database.
          """
          # TODO why is this or?
          if not cls._db or name:
              cls.create_db(name or settings.DATABASE_NAME)
          return cls._db
  
subject: revert and to or