def test_2_num_plurals_checkers(self):
        # in this testcase we add an extra msgstr[idx], we should be
        # disregarding it
        for _locale in [p for p in PLURALS if PLURALS[p][0] == 2]:
            if ['nn', 'no'] in _locale:
                _locale = 'nn_NO'
                num_plurals = PLURALS[_locale.split('_')[0]][0]
                plural_expr = PLURALS[_locale.split('_')[0]][1]
            else:
                num_plurals = PLURALS[_locale][0]
                plural_expr = PLURALS[_locale][1]
            try:
                locale = Locale(_locale)
                date = format_datetime(datetime.now(LOCALTZ),
                                       'yyyy-MM-dd HH:mmZ',
                                       tzinfo=LOCALTZ, locale=_locale)
            except UnknownLocaleError:
                # Just an alias? Not what we're testing here, let's continue
                continue
            po_file = (u"""\
# %(english_name)s translations for TestProject.
# Copyright (C) 2007 FooBar, Inc.
# This file is distributed under the same license as the TestProject
# project.
# FIRST AUTHOR <EMAIL@ADDRESS>, 2007.
#
msgid ""
msgstr ""
"Project-Id-Version: TestProject 0.1\\n"
"Report-Msgid-Bugs-To: bugs.address@email.tld\\n"
"POT-Creation-Date: 2007-04-01 15:30+0200\\n"
"PO-Revision-Date: %(date)s\\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\\n"
"Language-Team: %(locale)s <LL@li.org>\\n"
"Plural-Forms: nplurals=%(num_plurals)s; plural=%(plural_expr)s\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=utf-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
"Generated-By: Babel %(version)s\\n"

#. This will be a translator comment,
#. that will include several lines
#: project/file1.py:8
msgid "bar"
msgstr ""

#: project/file2.py:9
msgid "foobar"
msgid_plural "foobars"
msgstr[0] ""
msgstr[1] ""
msgstr[2] ""

""" % dict(locale=_locale,
                english_name=locale.english_name,
                version=VERSION,
                year=time.strftime('%Y'),
                date=date,
                num_plurals=num_plurals,
                plural_expr=plural_expr)).encode('utf-8')
            # we should be adding the missing msgstr[0]

            # This test will fail for revisions <= 406 because so far
            # catalog.num_plurals was neglected
            catalog = read_po(BytesIO(po_file), _locale)
            message = catalog['foobar']
            checkers.num_plurals(catalog, message)
dataset/ETHPy150Open python-babel/babel/tests/messages/test_checkers.py/CheckersTestCase.test_2_num_plurals_checkers/swapped operands of `in`