如何将数据保存到下一列

Question

我正在编写一个csv文件，它将数据添加到这样的行中

但是你想要这样吗

我在列表[]中添加数据并使用它写入文件：

def writefiles(alldata, filename):
    with open ("./"+ filename, "w") as csvfile:
        csvfile = csv.writer(csvfile, delimiter=",")
        csvfile.writerow("")
        for i in range(0, len(alldata)):
            csvfile.writerow(alldata[i])

writefiles(alldata, "Data.csv")

我该怎么做

Answer 1

您可以使用itertools.groupby将alldata转换为所需的格式：

from itertools import groupby, chain
from operator import itemgetter
writefiles([[k, *chain.from_iterable(r for _, *r in g)] for k, g in groupby(alldata, key=itemgetter(0))], "Data.csv")