Method start

IPython/core/historyapp.py:148–159

(self)

    ))

    def start(self):
        if self.subapp is None:
            print(
                "No subcommand specified. Must specify one of: "
                + ", ".join(map(repr, self.subcommands))
                + ".\n"
            )
            self.print_description()
            self.print_subcommands()
            self.exit(1)
        else:
            return self.subapp.start()