如何连接给定文件中的两行？

def connect_lines(file_path, line1, line2):
    # 打开文件并读取内容
    with open(file_path, 'r') as file:
        lines = file.readlines()

    # 定位要连接的两行
    line1_index = line2_index = -1
    for i, line in enumerate(lines):
        if line.strip() == line1:
            line1_index = i
        elif line.strip() == line2:
            line2_index = i

    # 连接两行
    if line1_index != -1 and line2_index != -1:
        lines[line1_index] = lines[line1_index].strip() + lines[line2_index]

        # 删除第二行
        del lines[line2_index]

        # 保存更新后的文件内容
        with open(file_path, 'w') as file:
            file.writelines(lines)

        print("连接成功！")
    else:
        print("未找到指定的两行。")

# 示例用法
file_path = "example.txt"
line1 = "This is line 1."
line2 = "This is line 2."
connect_lines(file_path, line1, line2)