如何在python中多次遍历文件

for i in range(n):  # n为需要多次遍历的次数
    with open('filename.txt', 'r') as file:
        for line in file:
            # 处理每一行的数据

with open('filename.txt', 'r') as file:
    for i in range(n):  # n为需要多次遍历的次数
        for line in file:
            # 处理每一行的数据
        file.seek(0)  # 将文件指针重置到开头

with open('filename.txt', 'r') as file:
    lines = file.readlines()  # 将文件内容读取到列表中
    for i in range(n):  # n为需要多次遍历的次数
        for line in lines:
            # 处理每一行的数据