def cancel_order(self, vt_orderid: str):
    '\n        Cancel an existing order.\n        '
    if self.trading:
        return self.cta_engine.cancel_order(self, vt_orderid)
    return False
Cancel an existing order.
def cancel_order(self, vt_orderid: str):
    '\n        \n        '
    if self.trading:
        return self.cta_engine.cancel_order(self, vt_orderid)
    return False