写CSV Python

Question

我想从另一个csv文件（viewDidDisAppear）中写入csv（outfile）文件。在infile csv数据中写这样的infile我想写OF0A0C,00,D0,0F11AFCB与outfile相同，但我得到这样infile 我的代码是这样的：

"\r \n 0,F,0,A,0,C,","0,0,","D,0,","0,F,1,1,A,F,C,B \r \n

写完后我想将行中的每个数据保存到列表中，如with open ("from_baryon.csv", "r") as inFile: with open (self.filename, "a") as outFile: for line in inFile: OutFile = csv.writer (outFile) OutFile.writerow (line)

我很困惑，保存这样的列表模式。三江源

Answer 1

几个问题 -

1. 您应该使用csv模块csv.reader()来阅读输入csv文件，而不是遍历其行，因为当您遍历其行时，您将获得返回的行作为迭代中的字符串 - for line in inFile:，然后您使用OutFile.writerow(line)写回此行，因此它将每个字符写入不同的列。

2. 您不需要为每一行创建单独的OutFile = csv.writer (outFile)。

示例代码 -

with open ("from_baryon.csv", "r") as inFile:
    with open (self.filename, "a") as outFile:
        out_file = csv.writer (outFile)
        in_reader = csv.reader(inFile)
        for row in in_reader:
            out_file.writerow(row)

编辑：对于更新的第二个问题，您可以创建一个列表和一个计数器来跟踪完整长度。示例 -

with open ("from_baryon.csv", "r") as inFile:
    with open (self.filename, "a") as outFile:
        out_file = csv.writer (outFile)
        in_reader = csv.reader(inFile)
        data = []
        lencount = 0
        for row in in_reader:
            out_file.writerow(row)
            tlen = len(''.join(row))
            data.append([tlen] + row)
            lencount += tlen
        data.insert(0,[lencount])