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

问题描述

我最近更换了操作系统并使用了更新的 Python (2.7).在我的旧系统上，我曾经能够即时打印.例如，假设我有一个计算量很大的 for 循环:

for i in range(10):巨大的计算打印我

然后当代码完成每次迭代时，它会打印 i

但是，在我当前的系统上，python 似乎缓存了标准输出，以便终端在几分钟内空白，然后打印:

<前>123

在短时间内.然后，再过几分钟，它会打印:

<前>456

等等.如何在到达 print 语句后立即进行 python 打印?

解决方案

打印后尝试调用flush of stdout

导入系统...sys.stdout.flush()

或者使用 命令行 选项 -u 其中:

<块引用>

强制标准输入、标准输出和标准错误完全无缓冲.

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

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

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

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

4
5
6

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

解决方案

Try to call flush of stdout after the print

import sys

...
sys.stdout.flush()

Or use a command line option -u which:

Force stdin, stdout and stderr to be totally unbuffered.

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