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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 _insert_command(self, command):
 """ Insert command by replacing the current input buffer and display it on the text edit. """

        self._clear_user_buffer()
        tc = self.edit.textCursor()
        tc.insertText(command)
        self.edit.setTextCursor(tc)