修改文件行的内容_python3

#!/usr/bin/python3
def modify_line(file_path, line_number, new_content):
    with open(file_path, 'r') as file:
        lines = file.readlines()

    if line_number <= len(lines):
        lines[line_number - 1] = new_content

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

# 示例用法
file_path = 'example.txt'  # 文件路径
line_number = 3  # 要修改的行号
new_content = '新的内容\n'  # 新的行内容

modify_line(file_path, line_number, new_content)