Pytest - execute

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pytest test_mymath.py

============================= test session starts ==============================
platform darwin -- Python 3.6.3, pytest-3.3.0, py-1.5.2, pluggy-0.6.0
rootdir: /Users/gabor/work/training/python, inifile:
collected 1 item

examples/pytest/test_mymath.py .                                         [100%]

=========================== 1 passed in 0.01 seconds ===========================