在 python 的 "For line" 语句中从第 0 行重新启动

Question

我有一个代码如下：

while True:
with open('file', 'r') as file:
    for line in file:
        #Doing something with a different var a each iteration of the while True.

我想知道是否有办法在第0行重新启动"for line"循环，以便在while true开始之前只打开一次文件，而不是每次都打开一次。感谢

Answer 1

您实际上不必重新启动循环。你只需要回到文件的开头。

import os
f = open('file', 'r')  # don't use 'file' as a variable name
while True:
    f.seek(0)
    for line in f:
        # do stuff
f.close()