def save(tag=None, filename=None, passphrase=None):
        """Save object to file.

        @type tag: string
        @type filename: string
        @type passphrase: string
        """
Save object to file.

        @type tag: string
        @type filename: string
        @type passphrase: string
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/persisted/sob.py