关闭文件上的 Python ValueError I/O 操作

Question

我知道这听起来是一个常见错误，在 stackoverflow 上已被多次询问。但是，当我阅读了几乎所有相关主题时，我很确定我的问题是新问题。

我有两个文件如下：

ALL_USER_PATH = 'all.csv'
NEW_USER_PATH = 'new.csv'

我先打开“all”文件进行阅读

with open(ALL_USER_PATH, "r") as f:
    df = pd.read_csv(f) #pd is pandas
    f.close()

接下来，我删除“新”文件的内容并准备向其中写入新数据

if os.path.isfile(NEW_USER_PATH):
    os.remove(NEW_USER_PATH)

写入它，它工作正常

with open(NEW_USER_PATH, "a") as csv_n:
    #writer_n is to write new users
    writer_n = csv.writer(csv_n, delimiter=",", lineterminator='\n')
    for user in customer_records:         
        if checkExistence(df): # a method I wrote before
            continue
        else:    
            writer_n.writerow([data_to_be_written])

接下来，我删除“all”文件并向其写入新数据

if os.path.isfile(ALL_USER_PATH):
    os.remove(ALL_USER_PATH)

with open(ALL_USER_PATH, "a") as csv_a:
    writer_a = csv.writer(csv_n, delimiter=",", lineterminator='\n')

    for user in customer_records:
        writer_a.writerow([all_data_to_be_written])

错误

“关闭文件的ValueError i/o操作”

在最后一行被抛出以将数据写入“all”文件。我想是因为我以前打开过，但我确实记得在读取数据后关闭它，不是吗？有人可以让我知道问题是什么吗？

Answer 1

我也遇到了这个错误，但发现另一个问题的答案并且有效。

将缩进块留在with open (csv file.csv) as csv: 下后，它将关闭文件。

with open('ALL_USER_PATH','a') as csv_a:
    writer_a = csv.writer(csv_n, delimiter=",", lineterminator='\n')
    # Here the file stays open
# Here the file is closed

希望我能帮上忙。