在Python中搜索并替换文件中的一行

import re

def replace_line(file_path, search_pattern, replace_string):
    with open(file_path, 'r') as file:
        lines = file.readlines()

    for i, line in enumerate(lines):
        if re.search(search_pattern, line):
            lines[i] = re.sub(search_pattern, replace_string, line)
            break

    with open(file_path, 'w') as file:
        file.writelines(lines)

# 使用示例
file_path = 'example.txt'
search_pattern = 'old_text'
replace_string = 'new_text'
replace_line(file_path, search_pattern, replace_string)