Question

我需要删除我的csv文件的第二行。

我正在使用下面的代码，但遗憾的是它不起作用。

data = ""
adresse = "SLV.csv"

if os.path.exists(adresse) :
    f = open(adresse,"ab")
    writer = csv.writer(f,delimiter = ",") 
    reader = csv.reader(open(adresse,"rb") , delimiter = ",")


    for line in reader:

        if reader.line_num == 2:    
            writer.writerow(line) 

    f.close()

Answer 1

由于你要做的只是删除第二行，使用csv模块是过度的。如果文件是逗号分隔数据或Vogon诗歌，则无关紧要。写下前面部分，跳过中间部分并写下结尾。

import shutil

# generate test file
with open('x.txt', 'w') as f:
    for i in range(10):
        f.write('line %d\n' % i)

# skip one line
with open('x.txt','rb') as rd, open('x.txt', 'rb+') as wr:
    wr.write(rd.readline())
    rd.readline()
    shutil.copyfileobj(rd, wr)
    wr.truncate()

print open('x.txt').read()

Answer 2

写入临时文件并在以下后更新原始文件：

if os.path.exists(adresse) :
    with open(adresse,"r") as f,open("temp.csv" "a+") as temp:    
        writer = csv.writer(temp,delimiter = ",")
        reader = csv.reader(f , delimiter = ",")
        for ind, line in enumerate(reader):
            if ind == 2:
                continue
            else:
               temp.writerow(line)
        temp.seek(0)
        with open(adresse,"w") as out:
            reader = csv.reader(temp , delimiter = ",")
            writer = csv.writer(out,delimiter = ",")
            for row in reader:
                writer.writerow(line)

如果可以将文件读入内存，只需在阅读器上调用列表并删除第二个元素：

if os.path.exists(adresse) :
    with open(adresse,"r") as f:
        reader = list(csv.reader(f , delimiter = ","))
        reader.pop(1)
        with open(adresse,"w") as out:
            writer = csv.writer(out,delimiter = ",")
            for row in reader:
                writer.writerow(row)

Answer 3

如果我理解正确您正在尝试制作新文件而您不想插入第2行。如果这是您的情况，您的程序中存在一个微不足道的错误，即：

if reader.line_num != 2:    
        writer.writerow(line)

Answer 4

这是我的解决方案，您可以编写更少的代码：

>>> import pyexcel as pe         #  pip install pyexcel
>>> sheet = pe.load("SLV.csv")
>>> del sheet.row[1]             # first row starts at index 0
>>> sheet.save_as("SLV.csv")

Answer 5

我同意tdelaney，这是一个更紧凑的解决方案

lines = open('x.txt', 'r').readlines()
lines.remove(1)
open('x.txt', 'w').writelines(lines)

如何使用Python删除CSV文件的第二行

5 个答案: