我正在創(chuàng)建一個(gè)應(yīng)用程序來本質(zhì)上充當(dāng)一個(gè)資產(chǎn)數(shù)據(jù)庫(kù)，我試圖打開一個(gè)CSV文件，讀取值并相應(yīng)地更新它們。我看到很多關(guān)于如何讀寫CSV文件的教程，但是我找不到一個(gè)詳細(xì)介紹如何迭代CSV文件和更新單個(gè)值的教程。理想情況下，與列表相比，使用字典似乎更容易，因此我可以按關(guān)鍵字(部件名稱)進(jìn)行搜索。它在大多數(shù)情況下都能工作，但是我在將更新后的列表寫入CSV文件時(shí)遇到了問題。我得到了以下錯(cuò)誤：“第155行，書面形式

返回自撰稿人(self.\u dict_to_列表(rowdict))

值錯(cuò)誤：對(duì)關(guān)閉的文件執(zhí)行I/O操作def write(part_name, part_num="null"):

with open("Database.csv", "r") as file_read:

fieldnames=["Part_Name", "Part_Num"]

csv_reader = csv.DictReader(file_read, fieldnames=fieldnames)

temp_list = [] # Create temp copy of the csv file

for line in csv_reader: # Reading the CSV file and storing it in temp_list

temp_list.append(line)

for line in temp_list: # Printing the original list to verify contents were read correctly

print (line)

for line in temp_list: # Reading each element in the list and updating the value if different from the value passed into the function

if (line["Part_Name"] == part_name and line["Part_Num"] != part_num):

line["Part_Num"] = part_num

for line in temp_list: # Printing out the new vesion of the temp_list to verify updates took

print (line)

with open("Database.csv", "w") as file_write:

csv_writer = csv.DictWriter(file_write, fieldnames=fieldnames)

for line in temp_list: # Attempting to write the updated temp_list to the csv file

csv_writer.writerow(line)

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