proxybase.py 文件源码

def __getattr__(self, name):
        """ Handle unknown attribute lookups """
        if name == "readonly":
            return True
        sname = name.split('_')
        if sname[:2] == ['get', 'unfiltered']:
            """
            Handle get_unfiltered calls.  Return the name of the access
            method for the base database object.  Call setattr before
            returning so that the lookup happens at most once for a given
            method call and a given object.
            """
            attr = getattr(self.basedb, 'get_' + sname[2] + '_from_handle')
            setattr(self, name, attr)
            return attr

        # if a write-method:
        if (name in DbWriteBase.__dict__ and
                not name.startswith("__") and
                type(DbWriteBase.__dict__[name]) is types.FunctionType):
            raise AttributeError
        # Default behaviour: lookup attribute in parent object
        return getattr(self.db, name)