'Place a batch of orders.
Parameters
order_arg_lists : iterable[tuple]
Tuples of args that `order` expects.
Returns
order_ids : list[str or None]
The unique identifier (or None) for each of the orders placed
(or not placed).
Notes
This is required for `Blotter` subclasses to be able to place a batch
of orders, instead of being passed the order requests one at a time.'

def batch_order(self, order_arg_lists):

    return [self.order(*order_args) for order_args in order_arg_lists]
