写入文件的特定列

import csv

input_file = 'input.csv'
output_file = 'output.csv'
target_column = 2

with open(input_file, 'r') as file_in, open(output_file, 'w', newline='') as file_out:
    reader = csv.reader(file_in)
    writer = csv.writer(file_out)

    for row in reader:
        if len(row) > target_column:
            writer.writerow([row[target_column]])

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileColumnWriter {
    public static void main(String[] args) {
        String inputFilePath = "input.csv";
        String outputFilePath = "output.csv";
        int targetColumn = 2;

        try (BufferedReader reader = new BufferedReader(new FileReader(inputFilePath));
             BufferedWriter writer = new BufferedWriter(new FileWriter(outputFilePath))) {

            String line;
            while ((line = reader.readLine()) != null) {
                String[] columns = line.split(",");
                if (columns.length > targetColumn) {
                    writer.write(columns[targetColumn]);
                    writer.newLine();
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}