Python CSV更改分隔符 [英] Python CSV change separator

问题描述

对于一个研究项目，我有很多csv文件，我需要将它们从逗号（，）分隔为分号（;）分隔。所以我只需要更改分隔符。

For a study project I have many many csv files that I need to change from comma (,) separated to semicolon (;) separated. So I only need to change the separator.

我通常在Excel中执行此操作，但这需要大量工作。而且我需要分别为每个文件执行此操作，而Excel需要大量时间来执行此操作。

I normally do it in Excel, but that takes a lot of work. And there I need to do it for every file separately plus Excel take a lot of time to do it.

我已经创建了一个输入和输出文件夹。
在下面的代码中工作正常。
问题是：

I have made a input and output folder. That works fine in the code below. The problem is:

1. 逗号不会以分号更改。


2. ，由于某种原因，它添加了一个空白行，我不知道为什么会这样做。

有人可以给一些提示吗？

Can somebody give some tips?

import csv 
from pathlib import Path

folder_in = Path(r'C:\convert\Trajectory\In') 
folder_out = Path(r'C:\convert\Trajectory\Out')

for incsv in folder_in.iterdir():
    outcsv = folder_out.joinpath(incsv.name)
    with open(str(incsv), 'r') as fin, open(str(outcsv), 'w') as fout:
        reader = csv.DictReader(fin)
        writer = csv.DictWriter(fout, reader.fieldnames, delimiter=';')
        writer.writeheader()
        writer.writerows(reader)

推荐答案

没有答案，这是我对同一文件中以逗号分隔的csv逗号分隔的建议：

There are no answer, here is my proposition for a csv comma to semicolon implementation on the same file:

path="file_to_convert.csv"

reader = list(csv.reader(open(path, "rU"), delimiter=','))
writer = csv.writer(open(path, 'w'), delimiter=';')
writer.writerows(row for row in reader)

我使用了列表（ ），因此将保留阅读器的内容，然后我重新打开文件以将其写入。

I used the list() so the content of reader is kept and I reopen the file to write in it.

如果您不需要更改在同一文件中，您可以选中 answer 。

If you don't need the change to be in the same file you can check this answer.

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