[lang-ref] ( print_to_stderr ) ( python )

def test_print_to_stderr(capsys):
    import sys
    print('message1', file=sys.stderr)
    captured = capsys.readouterr()
    assert captured.err == 'message1\n'

    sys.stderr.write('message2')
    captured = capsys.readouterr()
    assert captured.err == 'message2'