Question

我想在我的csv文件中删除一些字符串（“ Description”“ This is a Simulation”），并且我也想删除数据中的一些“ =”和数据末尾的“，”。该文件如下所示

"time","student","items"

="09:00:00","Tim","apple",

="09:00:10","Jason","orange",

"09:10:10","Emily","grape",

"09:22:10","Ivy","kiwi",

"Description"

"This is a simulation"

我尝试过.pop（）。它没用

ff= []

import csv

with open('file.csv') as f:

    for row in csv.DictReader(f):

        row.replace(',','')

        ff.append(row)

我想要这样：

"time","student","items"

"09:00:00","Tim","apple"

"09:00:10","Jason","orange"

"09:10:10","Emily","grape"

"09:22:10","Ivy","kiwi"

Answer 1

您可能希望将文件读取为原始文本文件，而不是csv，以便您更轻松地执行字符串操作。

编辑：我假设tmp是CSV文件的路径，而<list data>是csv.DictReader生成的字典列表。然后，您可以通过执行2个主要步骤来编写convert(tmp)。一种是将文件重新格式化为临时文件，另一种是使用csv.DictReader将临时文件读入字典数据列表。读取完数据后，将使用os模块删除临时文件：

import csv
import os

def convert(tmp):
    new_lines = []
    temp_file = tmp + '.tmp'
    with open(tmp) as fd:
        for line in fd:
            # remove new line characters
            line = line.replace('\n', '').replace('\r', '')

            # delete string
            line = line.replace('=', '').replace('"Description"', '').replace('"This is a simulation"', '')

            # don't add empty string
            if line.strip() == '':
                continue

            # remove last line commas
            if line[-1] == ',':
                line = line[:-1]

            new_lines.append(line)

    # write formatted data to temporary csv file
    with open(temp_file, 'w') as fd:
        fd.write('\n'.join(new_lines))

    # get list data
    ff = None
    with open(temp_file) as f:
        ff = list(csv.DictReader(f))

    # delete temporary file
    os.remove(temp_file)

    return ff

print convert('./file.csv')

Answer 2

大多数情况下都利用内置的str方法，并假设第一行始终是有效的标题行。

ff = []

with open('file.csv') as f:

    for row in f:
        # strip empty lines, and head/tail = ,
        line = row.strip().strip('=').strip(',')

        # skip empty lines
        if not line:
            continue

        # assume first row is always a valid header row
        # split by comma to see if it matches header row
        if not len(ff) or (len(line.split(',')) == len(ff[0].split(','))):
            ff.append(line)

Answer 3

尝试一下：

# Reading the file contents and storing it in a variable
file_data = open('file.csv', 'r').read()

# String Manipulation to get your desired format
file_data = file_data.replace("=", "").replace("Description", "").replace("This is a simulation", "").replace(",\n\n","\n\n")[:-7]

# Writing formatted text back to your csv file
f = open('file.csv','w').write(file_data)

操作后

file.csv ：-

"time","student","items"

"09:00:00","Tim","apple"

"09:00:10","Jason","orange"

"09:10:10","Emily","grape"

"09:22:10","Ivy","kiwi"

如何删除csv文件中的烦人数据

3 个答案: