替换文件中特定行号的字符

def replace_line_in_file(file_path, line_number, new_content):
    """
    替换文件中特定行号的字符
    :param file_path: 文件路径
    :param line_number: 行号（从1开始）
    :param new_content: 新的内容
    """
    try:
        with open(file_path, 'r', encoding='utf-8') as file:
            lines = file.readlines()
        
        if line_number <= len(lines):
            lines[line_number - 1] = new_content + '\n'
        else:
            print(f"行号 {line_number} 超出文件范围")
            return
        
        with open(file_path, 'w', encoding='utf-8') as file:
            file.writelines(lines)
        print(f"行号 {line_number} 的内容已成功替换为：{new_content}")
    except Exception as e:
        print(f"发生错误：{e}")

# 示例调用
replace_line_in_file('example.txt', 3, '这是新的内容')