如何在 python 中的 csv 文件的起始位置添加列？

Question

我有一个 python 程序可以将 csv 文件转换为“^”分隔符文件。输出文件也有新的 headers.

cc = input("Enter Code \t")
cn = input("Enter Item Number \t")
input_file = input("Enter input file \t")
act = input("Enter Action (Update- N/Delete -Y) \t")

def file_conversion(input_file, output_file_pattern, chunksize):

    with open(input_file,"r+") as fin:
        # ignore headers of input files
        for i in range(1):
            fin.__next__()
        reader = csv.reader(fin, delimiter=',')
        for i, chunk in enumerate(chunked(reader, chunksize)):
            with open(output_file_pattern.format(i), 'w', newline='') as fout:
                writer = csv.writer(fout,reader,delimiter='^')
                writer.writerow(headers)
                writer.writerows(chunk)
                print("Successfully converted into", output_file_pattern)

程序现在可以运行我想在输出定界符文件的每一行中添加act、cc 和cn。输出文件的行应该像下面的行一样开始

act^cc^cn^restofcsvdelimitierfiles.

Answer 1

这解决了我的问题

def add_column_in_csv(input_file, output_file, transform_row,transform_row1,transform_row2):
                with open(input_file, 'r') as read_obj:
                    with open(output_file, 'w', newline='') as write_obj:
                        reader = csv.reader(read_obj,delimiter=',')
                        writer = csv.writer(write_obj)
                        for row in reader:
                            transform_row(row,reader.line_num)
                            transform_row1(row,reader.line_num)
                            transform_row2(row,reader.line_num)
                            writer.writerow(row)
add_column_in_csv(path0,path1, lambda row, line_num: row.insert(0, act),lambda row, line_num: row.insert(1,cc),lambda row, line_num: row.insert(2,cn))

如何在 python 中的 csv 文件的起始位置添加列？

How to add columns in the starting position of a csv file in python?

python

python-3.x

csv

delimiter

file-handling