Improve this code (Receipt alike)

[Leonzxd]

def print_heading(): 
    print('{:^50s}'.format("MyShop"))
    print('Prodcode        Quantity        Price   Amount(RM)\n')
 
def print_receipt(entry): 
    total = float(entry[1] * entry[2]) 
    print('{:<16}{:<16}{:<8.2f}{:<8.2f}'.format(entry[0], entry[1], entry[2], total))
    return total
 
def my_purchases(): 
    prodcodes = ['AAA', 'BBB', 'CCC', 'DDD', 'EEE', 'FFF'] 
    prices = [5.00, 7.00, 2.30, 1.70, 9.00, 10.50] 
    
    prods = [] 
    qty = 1    
 
    while True: 
        prod = input('Product code (x to exit): ')
        prod = prod.upper()
        if prod == '' or prod == 'X':
            break
        elif prod in prodcodes:
            price = prices[prodcodes.index(prod.strip())] 
            prods.append([prod, qty, price]) 
        else:
            print('Invalid product code, try again')
            continue
        qty = (input("Enter Quantity: "))
        if qty == '' or qty == '0':
            break
        qty = int(qty)
        
 
    print_heading()
    total = 0
    for entry in prods:
        total += print_receipt(entry)
    print('Total: ${:<8.2f}'.format(total))



if __name__ == '__main__':  #If __name__ == '__main__' then can run the next line.Unless there is imported python file at the beginning.
    my_purchases()

Output:
Product code (x to exit): BBB

Enter Quantity: 1

Product code (x to exit): DDD

Enter Quantity: 2

Product code (x to exit): EEE

Enter Quantity: 4

Product code (x to exit): x
                      MyShop                      
Prodcode        Quantity        Price   Amount(RM)

BBB             1               7.00    7.00    
DDD             1               1.70    1.70    
EEE             2               9.00    18.00   
Total: $26.70  

Why those it not store properly...?
I changed the arrangement of the Prod and Quantity only...