Открываю файл, но говорю, что файл не открыт. Я зациклился на том, что делать. Я новичок в python.Я продолжаю получать эту ошибку, и я не знаю, как это сделать.
Здесь ошибка:
Traceback (most recent call last):
File "\\users2\121721$\Computer Science\Progamming\task3.py", line 43, in <module>
file.write(barcode + ":" + item + ":" + price + ":" +str(int((StockLevel- float(HowMany)))))
ValueError: I/O operation on closed file.
Вот код:
#open a file in read mode
file = open("data.txt","r")
#read each line of data to a vairble
FileData = file.readlines()
#close the file
file.close()
total = 0 #create the vairble total
AnotherItem = "y" # create
while AnotherItem == "y" or AnotherItem == "Y" or AnotherItem == "yes" or AnotherItem == "Yes" or AnotherItem == "YES":
print("please enter the barcode")
UsersItem=input()
for line in FileData:
#split the line in to first and second section
barcode = line.split(":")[0]
item = line.split(":")[1]
price = line.split(":")[2]
stock = line.split(":")[3]
if barcode==UsersItem:
file = open("data.txt","r")
#read each line of data to a vairble
FileData = file.readlines()
#close the file
file.close()
print(item +" £" + str(float(price)/100) + " Stock: " + str(stock))
print("how many do you want to buy")
HowMany= input()
total+=float(price) * float(HowMany)
for line in FileData:
#split the line in to first and second section
barcode = line.split(":")[0]
item = line.split(":")[1]
price = line.split(":")[2]
stock = line.split(":")[3]
if barcode!=UsersItem:
open("data.txt","w")
file.write(barcode + ":" + item + ":" + price + ":" +stock)
file.close()
else:
StockLevel=int(stock)
open("data.txt","w")
file.write(barcode + ":" + item + ":" + price + ":" +str(int((StockLevel-float(HowMany)))))
file.close()
open("data.txt","w")
StockLevel=int(stock)
print("Do you want to buy another item? [Yes/No]")
AnotherItem = input()
if AnotherItem == "n" or "N" or "no" or "No" or "NO":
print("total price: £"+ str(total/100))
У вас нет созданного объекта 'file', как вы можете сделать' file.write', если нет 'file = open (filename, mode)' any where near. –