是否向现有文本文件添加一行？

with open('file.txt', 'a') as file:
    file.write('New line\n')

import java.io.FileWriter;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            FileWriter writer = new FileWriter("file.txt", true);
            writer.write("New line\n");
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

using System.IO;

public class Program {
    public static void Main(string[] args) {
        using (StreamWriter writer = File.AppendText("file.txt")) {
            writer.WriteLine("New line");
        }
    }
}