ValueError：關閉的文件上的I/O操作 - 已經用GOOGLE搜索

Question

這個錯誤信息有什麼問題？我用Google搜索它，我仍然不知道

ERROR MESSAGE Traceback (most recent call last): File "C:\Users\Acer\Desktop\Python Code Testing Bed\Function 6 - still in progress.py", line 33, in writer.writerow([id_, name, combinedaddress, dateprinter, timeprinter, ', '.join(ingredients), totalprinter.group(1)]) ValueError: I/O operation on closed file

import csv 
from itertools import groupby 
from operator import itemgetter 
import re 

with open("rofl.csv", "rb") as f, open("out.csv", "wb") as out: 
    reader = csv.reader(f) 
    next(reader) 
    writer = csv.writer(out) 
    writer.writerow(["Receipt ID","Name","Address","Date","Time","Items","Amount","Cost","Total"]) 
    groups = groupby(csv.reader(f), key=itemgetter(0)) 
    for k, v in groups: 
     v = list(v) 
     id_, name = v[0] 
     add_date_1, add_date_2 = [x[1] for x in v[1:3]] 
     combinedaddress = add_date_1+ " " +add_date_2 
     dateplustime = [ x[1] for x in v[4:8] ] 
     abcd = str(dateplustime) 
     dateprinter = re.search('(\d\d/\d\d/\d\d\d\d)\s(\d\d:\d\d)', abcd).group(1) 
     timeprinter = re.search('(\d\d/\d\d/\d\d\d\d)\s(\d\d:\d\d)', abcd).group(2) 
     transaction = [ x[1] for x in v[8:] ] 
     textwordfortransaction = str(transaction) 

     INGREDIENT_RE = re.compile(r"^\d+\s+([A-Za-z ]+)\s") 
     ingredients = [] 
     for string in textwordfortransaction: 
      match = INGREDIENT_RE.match(string) 
      if match: 
       ingredients.append(match.groups()) 
       continue 

totalprinter = re.search(r"\bTOTAL\b\s*(\d*).",textwordfortransaction) 
writer.writerow([id_, name, combinedaddress, dateprinter, timeprinter, ', '.join(ingredients), totalprinter.group(1)]) 

Answer 1

這是你打開文件：

with open("rofl.csv", "rb") as f, open("out.csv", "wb") as out: 

的with塊建立上下文。只要這種情況下，該文件將被關閉。此：

writer.writerow([id_, name, combinedaddress, dateprinter, timeprinter, ', '.join(ingredients), totalprinter.group(1)]) 

...在with塊之外。程序到達此語句時文件已關閉，因爲with塊已結束。

將write.writerow縮進到with區塊內。