在不擦除文件内容的情况下添加到文件

with open('filename.txt', 'a') as file:
    file.write('New content to be appended\n')

#include <stdio.h>

int main() {
    FILE *file = fopen("filename.txt", "r+"); // 以读写模式打开文件
    fseek(file, 0, SEEK_END); // 将文件指针移动到文件末尾
    fprintf(file, "New content to be appended\n"); // 写入新的内容
    fclose(file);
    return 0;
}

import shutil

# 创建临时文件
temp_file = 'temp.txt'
original_file = 'filename.txt'

# 复制原文件内容到临时文件
with open(original_file, 'r') as src_file, open(temp_file, 'w') as dest_file:
    dest_file.write(src_file.read())

# 在临时文件中添加新的内容
with open(temp_file, 'a') as file:
    file.write('New content to be appended\n')

# 将临时文件重命名为原文件
shutil.move(temp_file, original_file)