Python-3.x time.sleep()不适合打印到文件

Question

我想编写一个python代码，它每隔x秒添加一个值。但是，当我添加time.sleep(x)时，.txt文件中就没有输出了。

有没有办法在一定时间后停止循环？

代码：

f = open('Log.txt','a')
while True:
    print("This prints once a second.", file=f)
    time.sleep(1)

Answer 1

也许是这样的：

import time
while True:
    with open('Log.txt','a') as f:
        f.write("This prints once a second.\n")
    time.sleep(1)

如果您想在给定的时间之后停止：

import time
stop_after = 10 # seconds
start = time.time()

while time.time() - start < stop_after:
    with open('Log.txt','a') as f:
        f.write("This prints once a second.\n")
    time.sleep(1)

Answer 2

最好使用上下文管理器，这是可行的：

import time

while True:
    with open('Log.txt','a') as f:
        print("This prints once a second.",file=f)
    time.sleep(1)