หมายเลขรุ่นใดมีหมายเลขคำสั่งซื้อ TMDML44BKX5LD?
Which model number has an order part number of TMDML44BKX5LD?
df = pd.DataFrame(columns=['model_number', 'order_part_number'])
df[df['order_part_number'] == 'TMDML44BKX5LD']['model_number']