Question

文件看起来像这样：

2014-01-01    a    a   a
2014-01-01    a        a
2014-01-01    a    a

我想浏览所有行并在空行中添加NoData：输出应该如下所示：

2014-01-01    a    a   a
2014-01-01    a    NodData    a
2014-01-01    a    a    NoData

我应该用csv reader打开文件而不是遍历所有行吗？如何定义空单元格/行

Answer 1

import csv

with open('path/to/input') as infile, open('path/to/input', 'w') as fout:
    outfile = csv.writer(fout)
    for row in csv.reader(infile):
        row = [cell if cell else 'NoData' for cell in row]
        outfile.writerow(row)

如果要覆盖输入文件：

import csv

with open('path/to/input') as infile: rows = list(csv.reader(infile))
with open('path/to/input', 'w') as fout:
    outfile = csv.writer(fout)
    for row in ([cell if cell else 'NoData' for cell in row] for row in rows)
        outfile.writerow(row)

如果要对目录中的所有csv文件执行此操作：

import csv
import glob
import os

dirpath = "/Users/Kevin/Desktop/DataArena/"
for infilepath in glob.glob(os.path.join(dirpath, "*.csv")):
    with open(infilepath) as infile: rows = list(csv.reader(infile))
    with open(infilepath, 'w') as fout:
        outfile = csv.writer(fout)
        for row in ([cell if cell else 'NoData' for cell in row] for row in rows)
            outfile.writerow(row)

在没有数据的每一行中写入NoData（python 3.x）

1 个答案: