def get_current_head(graph):
    """
    Get the current database head revision, if any.

    """
    session = new_session(graph)
    try:
        result = session.execute("SELECT version_num FROM alembic_version")
    except ProgrammingError:
        return None
    else:
        return result.scalar()
    finally:
        session.close()
def get_current_head ( graph ) : session = new_session ( graph ) try : result = session . execute ( "SELECT version_num FROM alembic_version" ) except ProgrammingError : return None else : return result . scalar ( ) finally : session . close ( )
Get the current database head revision, if any.