multistore_file.py 文件源码

def __init__(self, filename, warn_on_readonly=True):
        """Initialize the class.

        This will create the file if necessary.
        """
        self._file = LockedFile(filename, 'r+', 'r')
        self._thread_lock = threading.Lock()
        self._read_only = False
        self._warn_on_readonly = warn_on_readonly

        self._create_file_if_needed()

        # Cache of deserialized store. This is only valid after the
        # _MultiStore is locked or _refresh_data_cache is called. This is
        # of the form of:
        #
        # ((key, value), (key, value)...) -> OAuth2Credential
        #
        # If this is None, then the store hasn't been read yet.
        self._data = None