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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 complete(self, e):
 # (TAB)
 u"""Attempt to perform completion on the text before point. The
 actual completion performed is application-specific. The default is
 filename completion."""

        completions = self._get_completions()
        if completions:
            cprefix = commonprefix(completions)
            if len(cprefix) > 0:
                rep = [ c for c in cprefix ]
                point=self.l_buffer.point
                self.l_buffer[self.begidx:self.endidx] = rep
                self.l_buffer.point = point + len(rep) - (self.endidx - self.begidx)
            if len(completions) > 1:
                if self.show_all_if_ambiguous == u'on':
                    self._display_completions(completions)
                else:
                    self._bell()
        else:
            self._bell()
        self.finalize()