Can I run line_profiler over a pytest test?

Run pytest like this:

python3 -m cProfile -o profile -m pytest

You can even pass in optional arguments:

python3 -m cProfile -o profile -m pytest tests/worker/test_tasks.py -s campaigns

This will create a binary file called profile in your current directory. This can be analyzed with pstats:

import pstatsp = pstats.Stats('profile')p.strip_dirs()p.sort_stats('cumtime')p.print_stats(50)

This will print the 50 lines with the longest cumulative duration.

To get cProfile and line_profiler to work with py.test code, I did two things:

1. Extended the py.test test code with a call to pytest.main(), which made it executable with the python interpreter as the main driver:

   # pytest_test.py:@profile # for line_profiler onlydef test_example():    x = 3**32    assert x == 1853020188851841# for profiling with cProfile and line_profilerimport pytestpytest.main(__file__)

   Now you can run this test without py.test as the main driver using other tools:

   $ kernprof.py -l pytest_test.py$ python -m line_profiler pytest_test.py.lprof

   or

   $ python -m cProfile pytest_test.py

2. To profile py.test-specific functions such as pytest_funcarg*() with line_profiler I split them in two to avoid confusion between py.test and line_profiler:

   def pytest_funcarg__foo(request):    return foo(request)@profiledef foo(request):...

The same method works for memory_profiler.

Have you tried the pytest-profiling plugin?