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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(self):
 """Show the overfitting PDF summary."""

        try:
            if platform.system().lower().startswith('darwin'):
                subprocess.call(['open', self.pdf])
            elif os.name == 'nt':
                os.startfile(self.pdf)
            elif os.name == 'posix':
                subprocess.call(['xdg-open', self.pdf])
            else:
                raise IOError("")
        except IOError:
            log.info("Unable to open the pdf. Try opening it manually:")
            log.info(self.pdf)