py.test - How to print output when using pytest with xdist -

i'm using py.test run tests. i'm using pytest-xdist run tests in parallel. want see output of print statements in tests.

i have: ubuntu 15.10, python 2.7.10, pytest-2.9.1, pluggy-0.3.1.

here's test file:

def test_a():     print 'test_a'   def test_b():     print 'test_b'

when run py.test, nothing printed. that's expected: default, py.test captures output.

when run py.test -s, prints test_a , test_b, should.

when run py.test -s -n2, again nothing printed. how can print statements work while using -n2?

pytest-xdist use sys stdin/stdout control execution, way show print out should std.err.

import sys def test_a():     print >> sys.stderr, 'test_a'   def test_b():     print >> sys.stderr, 'test_b'

not idea, work.

also should note arg -s has no use if use xdist plugin.

in python 3, think logging.warning better choice, since set write stderr default.

import logging logging.basicconfig(format='%(message)s')  def test_a():     logging.warning('test_a')   def test_b():     logging.warning('test_b')

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