[python] How do I get time of a Python program's execution?

For the data folks using Jupyter Notebook

In a cell, you can use Jupyter's %%time magic command to measure the execution time:

%%time
[ x**2 for x in range(10000)]

Output

CPU times: user 4.54 ms, sys: 0 ns, total: 4.54 ms
Wall time: 4.12 ms

This will only capture the execution time of a particular cell. If you'd like to capture the execution time of the whole notebook (i.e. program), you can create a new notebook in the same directory and in the new notebook execute all cells:

Suppose the notebook above is called example_notebook.ipynb. In a new notebook within the same directory:

# Convert your notebook to a .py script:
!jupyter nbconvert --to script example_notebook.ipynb

# Run the example_notebook with -t flag for time
%run -t example_notebook

Output

IPython CPU timings (estimated):
  User   :       0.00 s.
  System :       0.00 s.
Wall time:       0.00 s.

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