fix flake8 warnings

tests/fields/test_complex_datetime_field.py

@@ -60,7 +60,7 @@ class ComplexDateTimeFieldTest(MongoDBTestCase):
             assert log == log1
 
         # Test string padding
-        microsecond = map(int, [math.pow(10, x) for x in range(6)])
+        microsecond = map(int, (math.pow(10, x) for x in range(6)))
         mm = dd = hh = ii = ss = [1, 10]
 
         for values in itertools.product([2014], mm, dd, hh, ii, ss, microsecond):

tests/fields/test_email_field.py

@@ -1,8 +1,6 @@
-import sys
-
 import pytest
 
-from mongoengine import *
+from mongoengine import Document, EmailField, ValidationError
 from tests.utils import MongoDBTestCase
 
 

tests/fields/test_fields.py

@@ -1357,9 +1357,9 @@ class TestField(MongoDBTestCase):
         foo.delete()
         bar = Bar.objects.get()
         with pytest.raises(DoesNotExist):
-            getattr(bar, "ref")
+            bar.ref
         with pytest.raises(DoesNotExist):
-            getattr(bar, "generic_ref")
+            bar.generic_ref
 
         # When auto_dereference is disabled, there is no trouble returning DBRef
         bar = Bar.objects.get()

tests/fields/test_file_field.py

@@ -11,7 +11,7 @@ from mongoengine import *
 from mongoengine.connection import get_db
 
 try:
-    from PIL import Image
+    from PIL import Image  # noqa: F401
 
     HAS_PIL = True
 except ImportError:

tests/fields/test_sequence_field.py

@@ -166,8 +166,8 @@ class TestSequenceField(MongoDBTestCase):
         ids = [i.id for i in Person.objects]
         assert ids == list(range(1, 11))
 
-        id = [i.id for i in Animal.objects]
-        assert id == list(range(1, 11))
+        _id = [i.id for i in Animal.objects]
+        assert _id == list(range(1, 11))
 
         c = self.db["mongoengine.counters"].find_one({"_id": "person.id"})
         assert c["next"] == 10