<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def batch_market_order(self, share_counts):
 """Place a batch market order for multiple assets. Parameters share_counts : pd.Series[Asset -> int] Map from asset to number of shares to order for that asset. Returns ------- order_ids : pd.Index[str] Index of ids for newly-created orders. """

        style = MarketOrder()
        order_args = [
            (asset, amount, style)
            for (asset, amount) in iteritems(share_counts)
            if amount
        ]
        return self.blotter.batch_order(order_args)