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%time, %timeitの結果を加工する

Last updated at Posted at 2019-12-04

Jupyter/IPythonで%time%timeitで実行時間を計測できるのはよく知られていると思いますが、これを加工したり可視化したいと思ったことはないでしょうか?

%%captureを使うと、標準出力をPythonのオブジェクトとして扱えます。
実際にやってみましょう。

%%capture result
%timeit 2 ** 100

%%captureの引数がオブジェクト名となります、ほかのオプションについてはヘルプを参照してください。

  %capture [--no-stderr] [--no-stdout] [--no-display] [output]

run the cell, capturing stdout, stderr, and IPython's rich display() calls.

positional arguments:
  output        The name of the variable in which to store output. This is a utils.io.CapturedIO
                object with stdout/err attributes for the text of the captured output.
                CapturedOutput also has a show() method for displaying the output, and __call__ as
                well, so you can use that to quickly display the output. If unspecified, captured
                output is discarded.

stdout属性を参照すると、標準出力が文字列に格納されていることがわかります。

print(result.stdout)
292 ns +- 4.24 ns per loop (mean +- std. dev. of 7 runs, 1000000 loops each)

この292 nsの部分を数値として扱えるように秒に変換してみます。

value, unit = result.stdout.split()[:2]
float(value) * {"s": 1, "ms": 1e-3, "us": 1e-6, "ns": 1e-9}[unit]
2.92e-07

%timeitに限らず、%%captureを使うとさまざまな出力をJupyter上から加工できます。よいJupyterライフを!

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