a mixin to use QT layouts as if they were context managers

QT_Ctx.py

def is_gui_item(obj):
    return isinstance(obj, QWidget) or isinstance(obj, QLayout)

class LayoutCtxMixin(object):

    PARENTED = set()  # tracks all widgets that have already been added to avoid double counting
    DEPTH = 0

    def __enter__(self):
        LayoutCtxMixin.DEPTH += 1
        self.context = {id(self)}

        try:
            outer_f = inspect.currentframe().f_back
            for v in outer_f.f_locals.values():
                if is_gui_item(v):
                    self.context.add(id(v))
            return self

        finally:
            del outer_f

    def __exit__(self, *args):
        try:
            outer_f = inspect.currentframe().f_back

            relevant_objects = (
                (k, v) for k, v in outer_f.f_locals.items()
                if is_gui_item(v) and
                id(v) not in self.context and
                id(v) not in self.PARENTED
            )

            for name, widget in relevant_objects:
                if isinstance(widget, QLayout):
                    self.addLayout(widget)
                else:
                    self.addWidget(widget)
                if not name.startswith("_"):
                    widget.setObjectName(name)
                self.PARENTED.add(id(widget))

            self.layout()
            LayoutCtxMixin.DEPTH -= 1
            return False

        finally:
            del outer_f

            if LayoutCtxMixin.DEPTH == 0:
                self.PARENTED.clear()