Question

我有一个csv文件，其中包含以下行：

0.10089,0,0,1,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0 0.10955,0,0,2,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0

我想复制每一行3次，然后更改每行(1,2,...)中的第4个元素，以便所有行（包括复制行）成为此顺序的一部分

0.10089,0,0,1,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0 0.10089,0,0,2,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0 0.10089,0,0,3,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0 0.10955,0,0,4,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0 0.10955,0,0,5,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0 0.10955,0,0,6,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0

我知道每个逗号的索引，因此知道第4个元素的位置

with fileinput.input(inplace=True) as f: for line in f: line = line.rstrip('\n') comma_pos_array = [i for i,x in enumerate(line) if x == ','] for i in range(3): print(line)

我尝试过从0 to (number of lines in f)*3创建一个连续整数数组然后用这个新数组中相应元素更改第4个元素的方法，但它们似乎不起作用。

任何帮助将不胜感激！

Answer 1

这是使用csv module读取和写入输入/输出的变体：

from io import StringIO
from csv import reader, writer

txt = '''0.10089,0,0,1,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0
0.10955,0,0,2,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0'''

REPEAT = 3

with StringIO(txt) as infile, StringIO() as outfile:

    rows = reader(infile)
    out_csv = writer(outfile)

    counter = 0

    for row in rows:
        for i in range(REPEAT):
            counter += 1
            row[3] = counter
            out_csv.writerow(row)

    print(outfile.getvalue())

并生成输出：

0.10089,0,0,1,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0
0.10089,0,0,2,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0
0.10089,0,0,3,0,0,0,0,0,0,-1.8,-0.7,1999998.0,0,0,0,80,81.226,158.25,0
0.10955,0,0,4,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0
0.10955,0,0,5,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0
0.10955,0,0,6,0,0,0,0,0,0,-1.5,0.4,-4.1,0,0,0,88.127,87.784,158.47,0

（您需要将StringIO部分替换为您的文件;我在这里使用它们来使示例自包含）

Answer 2

这将产生你想要的（没有csv模块）：

static_app
--admin
---css
---fonts
---img
---js
--static
---css
----nav_style.css
---fonts
---html
----myapp
-----base.html
---img
----stretchy_nav_cd-sprite-3.svg
---js
--...

Python复制每一行，然后在每一行中进行更改

2 个答案: