Question

我创建的程序会将投票中的信息写入新文件以获取结果，我需要在写入所有可用的投票选项之前检查文件是否为空。（否则，每次投票时，数据都会覆盖已输入的结果）。我的问题是，当我运行这段代码时，它没有返回任何内容。这是：

def VOTE1():
        Data = ("VOTE")
        voteChoice = OptionAmount.get()
        with open('EXISTINGVOTE.CSV') as infile:
            reader = csv.DictReader(infile)
            for row in reader:
                if voteChoice == row['TITLE NAME']:
                    f = open('{}.csv'.format(row['TITLE NAME']), "w")
                    f.close()
                    with open('{}.csv'.format(row['TITLE NAME']), "r") as f:
                        VoteRead = csv.reader(f, delimiter=",")
                        for row in VoteRead:
                            for field in row:
                                if field == Data:
                                    print("Empty file")
                                else:
                                    print("There is data in here")
                else:
                    print("Not this one")

我应该得到一个声明说'＃34;清空文件＆＃34;或者＆＃34;这里有数据＆＃34;

Answer 1

目前您通过打开文件来销毁文件内容......

f = open('{}.csv'.format(row['TITLE NAME']), "w")

...然后你读了一个空的新文件。

open('{}.csv'.format(row['TITLE NAME']), "r") as f

您可能想要做的是打开文件以附加数据：

if voteChoice == row['TITLE NAME']:
    # two lines deleted
    with open('{}.csv'.format(row['TITLE NAME']), "a") as f:

csv文件显示为空，而不是

1 个答案: