如何在文件中每行的开头追加一个字符串

# 定义要追加的字符串
append_string = "PREFIX_"

# 打开原始文件和目标文件
with open('original_file.txt', 'r') as infile, open('modified_file.txt', 'w') as outfile:
    for line in infile:
        # 在每行开头追加字符串并写入新文件
        outfile.write(append_string + line)

print("操作完成，结果已保存到 modified_file.txt")

#!/bin/bash

# 定义要追加的字符串
append_string="PREFIX_"

# 使用sed命令在每行开头追加字符串
sed "s/^/$append_string/" original_file.txt > modified_file.txt

echo "操作完成，结果已保存到 modified_file.txt"

import codecs

with codecs.open('original_file.txt', 'r', encoding='gbk') as infile, codecs.open('modified_file.txt', 'w', encoding='gbk') as outfile:
    for line in infile:
        outfile.write(append_string + line)