gistfile1.py

    # -------------------------------------------------------------------------
    def indexPage(self, ctx):
        scope = self
        class IndexPage(Conditional):
            def item(self):
                return scope.page if scope.page.index else None

        return IndexPage(ctx)


    # -------------------------------------------------------------------------
    def postTitle(self, ctx):
        scope = self
        class Title_(Scope):
            def posttitle(self, ctx):
                return scope.page.title

        class PostTitle(Conditional):
            def item(self):
                return Title_(parent=scope.page) if scope.page.title else None

        return PostTitle(ctx)

    # ( ... )