refactor: use try ImportError instead of py-version check (#1034)

rq/compat/__init__.py

@@ -13,10 +13,9 @@ def is_python_version(*versions):
     return False
 
 
-# functools.total_ordering is only available from Python 2.7 and 3.2
-if is_python_version((2, 7), (3, 2)):
+try:
     from functools import total_ordering
-else:
+except ImportError:
     def total_ordering(cls):  # noqa
         """Class decorator that fills in missing ordering methods"""
         convert = {

tests/__init__.py

@@ -6,11 +6,10 @@ import logging
 
 from redis import Redis
 from rq import pop_connection, push_connection
-from rq.compat import is_python_version
 
-if is_python_version((2, 7), (3, 2)):
+try:
     import unittest
-else:
+except ImportError:
     import unittest2 as unittest  # noqa
 
 

tests/test_cli.py

@@ -4,7 +4,6 @@ from __future__ import (absolute_import, division, print_function,
 
 from click.testing import CliRunner
 from rq import get_failed_queue, Queue
-from rq.compat import is_python_version
 from rq.job import Job
 from rq.cli import main
 from rq.cli.helpers import read_config_file, CliConfig
@@ -13,9 +12,9 @@ import pytest
 from tests import RQTestCase
 from tests.fixtures import div_by_zero
 
-if is_python_version((2, 7), (3, 2)):
+try:
     from unittest import TestCase
-else:
+except ImportError:
     from unittest2 import TestCase  # noqa