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python - 使用python替换和删除csv中的列

问题描述

这是我正在编写的代码

import csv
import openpyxl

def read_file(fn):
    rows = []

    with open(fn) as f:
        reader = csv.reader(f, quotechar='"',delimiter=",")
        for row in reader:
            if row:                     
                rows.append(row)
    return rows 


replace = {x[0]:x[1:] for x in read_file("replace.csv")}


delete = set( (row[0] for row in read_file("delete.csv")) )  


result = []

input_file="input.csv"
with open(input_file) as f:
    reader = csv.reader(f, quotechar='"')
    for row in reader:
        if row:
            if row[7] in delete:
                continue                                   
            elif row[7] in replace:

                result.append(replace[row[7]])   
            else:
                result.append(row)                       



with open ("done.csv", "w+", newline="") as f:
    w = csv.writer(f,quotechar='"', delimiter= ",")
    w.writerows(result)

这是我的文件：

输入.csv：

c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13
"-","-","-","-","-","-","-","aaaaa","-","-","bbbbb","-",","
"-","-","-","-","-","-","-","ccccc","-","-","ddddd","-",","
"-","-","-","-","-","-","-","eeeee","-","-","fffff","-",","

这是一个 13 列的 csv。我只对第 8 和第 11 个字段感兴趣。

这是我的替换.csv：

"aaaaa","11111","22222"

删除.csv：

ccccc

所以我正在做的是将replace.csv的第一列（逐行）与input.csv的第8列进行比较，如果它们匹配，则将input.csv的第8列替换为replace.csv的第二列和第11列输入与 replace.csv 的第三列和 delete.csv 它逐行比较两个文件，如果找到匹配，则删除整行。如果 replace.csv 或 delete.csv 中不存在任何行，则按原样打印该行。所以我想要的输出是：

c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13
"-","-","-","-","-","-","-",11111,"-","-",22222,"-",","
"-","-","-","-","-","-","-","eeeee","-","-","fffff","-",","

但是当我运行这段代码时，它给了我这样的输出：

c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13
11111,22222

我哪里错了？我正在尝试更改我之前发布的问题的程序。由于输入文件已更改，我正在尝试更改我的程序。 https://stackoverflow.com/a/54388144/9279313

标签： pythonpython-3.xcsv

解决方案

@anuj I think SafeDev's solution is optimal but if you don't want to go with pandas, just make little changes in your code. 

for row in reader:
    if row:
        if row[7] in delete:
            continue                                   
        elif row[7] in replace:
            key = row[7]
            row[7] = replace[key][0]
            row[10]= replace[key][1]
            result.append(row)
        else:
            result.append(row)

Hope this solves your issue.

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