def remove_format_kwarg(self, original_node, updated_node) -> cst.Call:
        """Removes the 'format' keyword argument from 'BitcoinTracker'."""
        new_args = [a for a in original_node.args if a.keyword.value != "format"]
        new_args[-1] = new_args[-1].with_changes(comma=cst.MaybeSentinel.DEFAULT)
        return updated_node.with_changes(args=new_args)
Removes the 'format' keyword argument from 'BitcoinTracker'.
libqtile/scripts/migrations/change_bitcoin.py