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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 _show_mpl_backend_errors(self):

 """
 Show possible errors when setting the selected Matplotlib backend.
 """

        if not self.external_kernel:
            self.shellwidget.silent_execute(
                    "get_ipython().kernel._show_mpl_backend_errors()")
        self.shellwidget.sig_prompt_ready.disconnect(
            self._show_mpl_backend_errors)