stockfile = open("stockfile.txt", "r")
newlevels = open("newstocklevel.txt", "w")
stockfile =[i.split() for i in stockfile][1:]
stock_level = dict()
print(stock_level)
for i in stockfile:
    stock_level[i[0]] = float(i[-1][1:])

targetlevel = 20

first_item = True
while True:
    yesno = input("Do you want to make an order?(yes/no)" )
    if yesno == "yes":
        gtin8 = input("Please enter your GTIN-8 code: ")
        quantity = int(input("What is the quantity that you require? "))

        #row = stockfile(gtin8)
        row[2] = str(int(stock_level) - int(quantity))
        for i in range(len(row)):
            row[i]  = row[i].rjust(MAX_FIELD_LEN)
        New_Stock = gtin8.rjust(MAX_FIELD_LEN) + ',' + ','.join(row) + 'n'
        print(New_Stock, len(New_Stock))
        f.seek(product_location[gtin8])
        f.write(New_Stock)

    f.close()

        #if not first_item:
        #    newlevels.write("t+n")
        #newlevels.write("t".format(gtin8)) #stocklevel2)
        #first_item = False
else:
    print("Here's how you may have gone wrong: Product not found-You have not typed in enough or too many digits-you have typed in a symbol or a letter")

    print(newlevels)