How do I profile a Python script?

Better Stack Team
Updated on February 17, 2023

By default, Python contains a profiler called cProfile. It not only gives the total running time, but also times each function separately, and tells you how many times each function was called, making it easy to determine where you should make optimizations.

You can call it from within your code:

import cProfile'foo()')

Even more usefully, you can invoke the cProfile when running a script:

python -m cProfile

With the output similar to this:

1007 function calls in 0.061 CPU seconds

Ordered by: standard name
ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    1    0.000    0.000    0.061    0.061 <string>:1(<module>)
 1000    0.051    0.000    0.051    0.000<lambda>)
    1    0.005    0.005    0.061    0.061<module>)
    1    0.000    0.000    0.061    0.061 {execfile}
    1    0.002    0.002    0.053    0.053 {map}
    1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler objects}
    1    0.000    0.000    0.000    0.000 {range}
    1    0.003    0.003    0.003    0.003 {sum}

To learn more about cProfile, you can visit the official documentation.

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