使 ipython notebook 实时打印 [英] Make ipython notebook print in real time

问题描述

Ipython Notebook 似乎无法实时打印结果，但似乎以某种方式进行缓冲，然后批量输出打印结果.如何在处理打印命令后立即让 ipython 打印我的结果?

Ipython Notebook doesn't seem to print results in real time, but seems to buffer in a certain way and then bulk output the prints. How can I make ipython print my results as soon as the print command is processed?

示例代码:

import time


def printer():
    for i in range(100):
        time.sleep(5)
        print i

假设上面的代码在一个导入的文件中.我怎么能做到当我调用打印机函数时，它每 5 秒打印一个数字，而不是最后打印一个数字?

Supposing that the above code is in a file that is imported. How could I make it that when I call the printer function it prints a number every 5 seconds and not all the numbers at the very end?

请注意，我无法编辑函数 printer()，因为它是从某个外部模块获取的.我希望以某种方式更改 ipython notebook 的配置，以便它不使用缓冲区.因此，我也不想使用 sys.stdout.flush()，我想根据问题实时执行，我不希望任何缓冲区开始.

Please note that I cannot edit the function printer() because I get it from some external module. I want the to change the configs of ipython notebook somehow so that it doesn't use a buffer. Therefore, I also do not wish to use sys.stdout.flush(), I want to do it in real-time according to the question, I don't want any buffer to start with.

我也尝试使用以下命令加载 ipython notebook:

I also tried loading ipython notebook with the command:

ipython notebook --cache-size=0

但这似乎也不起作用.

推荐答案

从 Python 3.3 开始，print() 有一个 附加刷新 可用于强制刷新的参数:

Since Python 3.3, print() has an additional flush argument that can be used to force flushing:

for i in range(10):
    print(i, flush=True)
    time.sleep(1)  

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