I made something, so after clicking a button, some text should appear in the TextView. Part of my code:

def on_button1_clicked(self, builer):
        self.writetest = self.builder.get_object("textview1")
        self.writetest.insert_at_cursor("something")

Unfortunately, when I click the button I get:

AttributeError: 'TextView' object has no attribute 'insert_at_cursor'

According to GTK Documentation there is such attribute: http://developer.gnome.org/gtk3/stable/GtkTextView.html#GtkTextView-insert-at-cursor

I have the same problem with Entry as well, if I change TextView to Entry. But if I use set_text instead of insert_at_cursor in my code, it works.