'Processes a list of splits by modifying any open orders as needed.
Parameters
splits: list
A list of splits.  Each split is a tuple of (asset, ratio).
Returns
None'

def process_splits(self, splits):

    for (asset, ratio) in splits:
        if (asset not in self.open_orders):
            continue
        orders_to_modify = self.open_orders[asset]
        for order in orders_to_modify:
            order.handle_split(ratio)
