捕获IPython魔术函数的结果 [英] Capture the result of an IPython magic function

问题描述

我正在尝试捕获IPython Notebook魔术函数的结果对象。具体来说，％timeit

I'm trying to capture the resulting object of IPython Notebook magic function. Specifically %timeit

所以下面的代码......

So the following code...

import time
def say_hello(n):
    time.sleep(n)
    print "hello"

t = %timeit say_hello(5)

打印到stdout：

1 loops, best of 3: 5 s per loop

但是，我想在变量 t ％timeit say_hello（5）的结果>。

However, I'd like to capture the result of %timeit say_hello(5) in the variable t.

一个名为 TimeitResult 由％timeit 生成，但我无法弄清楚如何从笔记本电脑中访问它。

A resulting object called TimeitResult is generated by %timeit, but I can't figure out how to access it from within a Notebook.

我想要一个更清洁的解决方案而不是使用 sys.stdout 技巧（这段代码将成为演示文稿的一部分，所以我试图将其保持为直截了当可能）。任何人都有任何想法？

I'd like a cleaner solution than having to manually capture stdout using sys.stdout tricks (this code will be part of a presentation so I'm trying to keep it as straight forward as possible). Anyone have any ideas?

推荐答案

在您链接的源文件中，docstring显示运行timeit magic函数的选项;其中一个是返回一个对象结果：

In the source file you linked to, the docstring shows the options for running the timeit magic function; one of which is returning an object result:

-o: return a TimeitResult that can be stored in a variable to inspect
        the result in more details.

所以，如果你运行

obj = %timeit -o somefunc()

obj 将引用返回的结果对象（提示：在对象上使用tab完成，它将显示它具有的属性）。

obj will reference the result object that was returned (hint: use tab completion on the object, that will show you the attributes it has).

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