实时python打印功能 [英] python print function in real time

问题描述

我最近切换了操作系统，并正在使用更新的Python(2.7).在旧系统上，我曾经能够即时打印.例如，假设我有一个计算密集的for循环:

I recently switched OS and am using a newer Python (2.7). On my old system, I used to be able to print instantaneously. For instance, suppose I had a computationally intense for loop:

for i in range(10):
  huge calculation
  print i

然后，当代码完成每次迭代时，它将打印i

then as the code completed each iteration, it would print i

但是，在我当前的系统上，python似乎缓存了stdout，以便终端空白几分钟，然后打印:

However, on my current system, python seems to cache the stdout so that the terminal is blank for several minutes, after which it prints:

1
2
3

一小段时间.然后，几分钟后，它将打印:

in short succession. Then, after a few more minutes, it prints:

4
5
6

，依此类推.到达print语句后，如何使python打印?

and so on. How can I make python print as soon as it reaches the print statement?

推荐答案

尝试在打印后调用标准输出的刷新

Try to call flush of stdout after the print

import sys

...
sys.stdout.flush()

或使用命令行选项-u，其中:

Or use a command line option -u which:

强制完全不缓冲stdin，stdout和stderr.

Force stdin, stdout and stderr to be totally unbuffered.

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