在python中加载txt文件的第n行，而不加载整个文件

def load_txt_line(file_path, line_number):
    with open(file_path, 'r') as file:
        for i, line in enumerate(file):
            if i == line_number - 1:
                return line.strip()
    return None

file_path = 'example.txt'
line_number = 5
line = load_txt_line(file_path, line_number)
if line is not None:
    print(f"第{line_number}行的内容是：{line}")
else:
    print(f"文件中没有第{line_number}行。")