pylint/extensions/overlapping_exceptions.py
def visit_tryexcept(self, node):
        """check for empty except"""
        for handler in node.handlers:
            if handler.type is None:
                continue
            if isinstance(handler.type, astroid.BoolOp):
                continue
            try:
                excs = list(_annotated_unpack_infer(handler.type))
            except astroid.InferenceError:
                continue

            handled_in_clause = []
            for part, exc in excs:
                if exc is astroid.Uninferable:
                    continue
                if isinstance(exc, astroid.Instance) and utils.inherit_from_std_ex(exc):
                    # pylint: disable=protected-access
                    exc = exc._proxied

                if not isinstance(exc, astroid.ClassDef):
                    continue

                exc_ancestors = [
                    anc for anc in exc.ancestors() if isinstance(anc, astroid.ClassDef)
                ]

                for prev_part, prev_exc in handled_in_clause:
                    prev_exc_ancestors = [
                        anc
                        for anc in prev_exc.ancestors()
                        if isinstance(anc, astroid.ClassDef)
                    ]
                    if exc == prev_exc:
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args="%s and %s are the same"
                            % (prev_part.as_string(), part.as_string()),
                        )
                    elif prev_exc in exc_ancestors or exc in prev_exc_ancestors:
                        ancestor = part if exc in prev_exc_ancestors else prev_part
                        descendant = part if prev_exc in exc_ancestors else prev_part
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args="%s is an ancestor class of %s"
                            % (ancestor.as_string(), descendant.as_string()),
                        )
                handled_in_clause += [(part, exc)]
def visit_tryexcept(self, node):
        """check for empty except"""
        for handler in node.handlers:
            if handler.type is None:
                continue
            if isinstance(handler.type, astroid.BoolOp):
                continue
            try:
                excs = list(_annotated_unpack_infer(handler.type))
            except astroid.InferenceError:
                continue

            handled_in_clause = []
            for part, exc in excs:
                if exc is astroid.Uninferable:
                    continue
                if isinstance(exc, astroid.Instance) and utils.inherit_from_std_ex(exc):
                    # pylint: disable=protected-access
                    exc = exc._proxied

                if not isinstance(exc, astroid.ClassDef):
                    continue

                exc_ancestors = [
                    anc for anc in exc.ancestors() if isinstance(anc, astroid.ClassDef)
                ]

                for prev_part, prev_exc in handled_in_clause:
                    prev_exc_ancestors = [
                        anc
                        for anc in prev_exc.ancestors()
                        if isinstance(anc, astroid.ClassDef)
                    ]
                    if exc == prev_exc:
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args="%s and %s are the same"
                            % (prev_part.as_string(), part.as_string()),
                        )
                    elif prev_exc in exc_ancestors or exc in prev_exc_ancestors:
                        ancestor = part if exc in prev_exc_ancestors else prev_part
                        descendant = part if prev_exc in exc_ancestors else prev_part
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args="%s is an ancestor class of %s"
                            % (ancestor.as_string(), descendant.as_string()),
                        )
                handled_in_clause += [(part, exc)]
def visit_tryexcept ( self , node ) : for handler in node . handlers : if handler . type is None : continue if isinstance ( handler . type , astroid . BoolOp ) : continue try : excs = list ( _annotated_unpack_infer ( handler . type ) ) except astroid . InferenceError : continue handled_in_clause = [ ] for part , exc in excs : if exc is astroid . Uninferable : continue if isinstance ( exc , astroid . Instance ) and utils . inherit_from_std_ex ( exc ) : # pylint: disable=protected-access exc = exc . _proxied if not isinstance ( exc , astroid . ClassDef ) : continue exc_ancestors = [ anc for anc in exc . ancestors ( ) if isinstance ( anc , astroid . ClassDef ) ] for prev_part , prev_exc in handled_in_clause : prev_exc_ancestors = [ anc for anc in prev_exc . ancestors ( ) if isinstance ( anc , astroid . ClassDef ) ] if exc == prev_exc : self . add_message ( "overlapping-except" , node = handler . type , args = "%s and %s are the same" % ( prev_part . as_string ( ) , part . as_string ( ) ) , ) elif prev_exc in exc_ancestors or exc in prev_exc_ancestors : ancestor = part if exc in prev_exc_ancestors else prev_part descendant = part if prev_exc in exc_ancestors else prev_part self . add_message ( "overlapping-except" , node = handler . type , args = "%s is an ancestor class of %s" % ( ancestor . as_string ( ) , descendant . as_string ( ) ) , ) handled_in_clause += [ ( part , exc ) ]
check for empty except
check for empty except