test_ok2/doc/en/naming20.rst

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.. _naming20:
New pytest names in 2.0 (flat is better than nested)
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If you used older version of the ``py`` distribution (which
included the py.test command line tool and Python name space)
you accessed helpers and possibly collection classes through
the ``py.test`` Python namespaces. The new ``pytest``
Python module flaty provides the same objects, following
these renaming rules::
py.test.XYZ -> pytest.XYZ
py.test.collect.XYZ -> pytest.XYZ
py.test.cmdline.main -> pytest.main
The old ``py.test.*`` ways to access functionality remain
valid but you are encouraged to do global renaming according
to the above rules in your test code.