fixed some linter warnings

tests/conftest.py

@@ -1,7 +1,7 @@
-import pytest
-
 import os
 
+import pytest
+
 
 @pytest.fixture
 def tracks_dir_path():

tests/test_functions.py

@@ -1,19 +1,20 @@
+import datetime
+
 import pytest
+import pytz
 
 import symuid
 
-import datetime as dt
-import pytz
-
 
-@pytest.mark.parametrize(('ts', 'expected_dt'), [
-    (1528795204, dt.datetime(2018, 6, 12, 9, 20, 4, tzinfo=dt.timezone.utc)),
+@pytest.mark.parametrize(('ts_sec', 'expected_dt'), [
+    (1528795204,
+     datetime.datetime(2018, 6, 12, 9, 20, 4, tzinfo=datetime.timezone.utc)),
 ])
-def test__timestamp_to_utc_dt(ts, expected_dt):
-    assert expected_dt == symuid._timestamp_to_utc_dt(ts)
+def test__timestamp_to_utc_dt(ts_sec, expected_dt):
+    assert expected_dt == symuid._timestamp_to_utc_dt(ts_sec)
 
 
 def test__utc_dt_now():
-    dt = symuid._utc_dt_now()
-    pytz_dt = dt.now(pytz.timezone('UTC'))
-    assert abs((dt - pytz_dt).total_seconds()) < 5
+    dt_now = symuid._utc_dt_now()
+    pytz_dt = datetime.datetime.now(pytz.timezone('UTC'))
+    assert abs((dt_now - pytz_dt).total_seconds()) < 5

tests/test_track.py

@@ -1,12 +1,12 @@
-import pytest
-
-import symuid
-
 import datetime as dt
-import mutagen
 import os
 import shutil
 
+import mutagen
+import pytest
+
+import symuid
+
 # TODO test aac / m4a itunes tags
 
 TRACKS_DIR_PATH = os.path.join(os.path.dirname(__file__), 'tracks')