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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 OnBackView(self, event):
 """Request to move backward in the history"""

        self.historyIndex -= 1
        try:
            self.RestoreHistory(self.history[self.historyIndex])
        except IndexError, err:
            self.SetStatusText(_('No further history available'))