class Warning(StandardError):
    pass

class Error(StandardError):
    pass
class InterfaceError(Error):
    pass
class DatabaseError(Error):
    pass
class DataError(DatabaseError):
    pass
class OperationalError(DatabaseError):
    pass
class IntegrityError(DatabaseError):
    pass
class InternalError(DatabaseError):
    pass
class ProgrammingError(DatabaseError):
    pass
class NotSupportedError(DatabaseError):
    pass
