我正在创建一个应用程序来本质上充当一个资产数据库，我试图打开一个CSV文件，读取值并相应地更新它们。我看到很多关于如何读写CSV文件的教程，但是我找不到一个详细介绍如何迭代CSV文件和更新单个值的教程。理想情况下，与列表相比，使用字典似乎更容易，因此我可以按关键字(部件名称)进行搜索。它在大多数情况下都能工作，但是我在将更新后的列表写入CSV文件时遇到了问题。我得到了以下错误：“第155行，书面形式
返回自撰稿人(self.\u dict_to_列表(rowdict))
值错误：对关闭的文件执行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)
)
