__init__.py 文件源码

def __init__(self, database, collection="fs"):
        """
        An instance of GridFS on top of a single Database.

        :Parameters:
          - `database`: a :class:`MotorDatabase`
          - `collection` (optional): A string, name of root collection to use,
            such as "fs" or "my_files"

        .. mongodoc:: gridfs

        .. versionchanged:: 0.2
           ``open`` method removed; no longer needed.
        """
        if not isinstance(database, MotorDatabase):
            raise TypeError("First argument to MotorGridFS must be "
                            "MotorDatabase, not %r" % database)

        self.io_loop = database.get_io_loop()
        self.collection = database[collection]
        self.delegate = self.__delegate_class__(
            database.delegate,
            collection,
            _connect=False)