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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def close_all(self):
 """ Closes all editors """

        if self._try_close_dirty_tabs():
            while self.count():
                widget = self.widget(0)
                self.remove_tab(0)
                self.tab_closed.emit(widget)
            return True
        return False