Drop dependency on pytz

... because the current usage can be easily re-implemented using
the built-in datetime library.

Change-Id: Ic0c7919f0288fd61dd5bfa402c99d7080ffd9083

magnum/tests/unit/api/test_servicegroup.py

@@ -14,7 +14,6 @@ import datetime
 from unittest import mock
 
 from oslo_utils import timeutils
-import pytz
 
 from magnum.api import servicegroup as svc_grp
 from magnum.tests.unit.api import base as api_base
@@ -69,19 +68,23 @@ class TestServiceGroup(api_base.FunctionalTest):
         self.assertTrue(is_up)
 
     def test_service_is_up_alive_with_latest_update(self):
-        kwarg = {'created_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC),
-                 'updated_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC),
-                 'last_seen_up': timeutils.utcnow(True)}
+        kwarg = {
+            'created_at': datetime.datetime(1970, 1, 1,
+                                            tzinfo=datetime.timezone.utc),
+            'updated_at': datetime.datetime(1970, 1, 1,
+                                            tzinfo=datetime.timezone.utc),
+            'last_seen_up': timeutils.utcnow(True)
+        }
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)
         self.assertTrue(is_up)
 
     def test_service_is_up_down(self):
-        kwarg = {'last_seen_up': datetime.datetime(1970, 1, 1,
-                                                   tzinfo=pytz.UTC)}
+        kwarg = {
+            'last_seen_up': datetime.datetime(1970, 1, 1,
+                                              tzinfo=datetime.timezone.utc)
+        }
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)
@@ -89,7 +92,7 @@ class TestServiceGroup(api_base.FunctionalTest):
 
     def test_service_is_up_down_with_create(self):
         kwarg = {'created_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC)}
+                                                 tzinfo=datetime.timezone.utc)}
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)
@@ -97,29 +100,33 @@ class TestServiceGroup(api_base.FunctionalTest):
 
     def test_service_is_up_down_with_update(self):
         kwarg = {'updated_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC)}
+                                                 tzinfo=datetime.timezone.utc)}
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)
         self.assertFalse(is_up)
 
     def test_service_is_up_down_with_all_three(self):
-        kwarg = {'last_seen_up': datetime.datetime(1970, 1, 1,
-                                                   tzinfo=pytz.UTC),
-                 'created_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC),
-                 'updated_at': datetime.datetime(1970, 1, 1,
-                                                 tzinfo=pytz.UTC)}
+        kwarg = {
+            'last_seen_up': datetime.datetime(1970, 1, 1,
+                                              tzinfo=datetime.timezone.utc),
+            'created_at': datetime.datetime(1970, 1, 1,
+                                            tzinfo=datetime.timezone.utc),
+            'updated_at': datetime.datetime(1970, 1, 1,
+                                            tzinfo=datetime.timezone.utc)
+        }
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)
         self.assertFalse(is_up)
 
     def test_service_is_up_down_with_old_update(self):
-        kwarg = {'last_seen_up': datetime.datetime(1970, 1, 1,
-                                                   tzinfo=pytz.UTC),
-                 'created_at': timeutils.utcnow(True),
-                 'updated_at': timeutils.utcnow(True)}
+        kwarg = {
+            'last_seen_up': datetime.datetime(1970, 1, 1,
+                                              tzinfo=datetime.timezone.utc),
+            'created_at': timeutils.utcnow(True),
+            'updated_at': timeutils.utcnow(True)
+        }
         magnum_object = obj_util.get_test_magnum_service_object(
             self.context, **kwarg)
         is_up = self.servicegroup_api.service_is_up(magnum_object)

magnum/tests/unit/api/utils.py

@@ -14,8 +14,6 @@ Utils for testing the API service.
 """
 import datetime
 
-import pytz
-
 from magnum.api.controllers.v1 import cluster as cluster_controller
 from magnum.api.controllers.v1 import cluster_template as cluster_tmp_ctrl
 from magnum.api.controllers.v1 import federation as federation_controller
@@ -58,7 +56,7 @@ def quota_post_data(**kw):
 
 def mservice_get_data(**kw):
     """Simulate what the RPC layer will get from DB """
-    faketime = datetime.datetime(2001, 1, 1, tzinfo=pytz.UTC)
+    faketime = datetime.datetime(2001, 1, 1, tzinfo=datetime.timezone.utc)
     return {
         'binary': kw.get('binary', 'magnum-conductor'),
         'host': kw.get('host', 'fake-host'),

test-requirements.txt

@@ -15,7 +15,6 @@ oslotest>=4.4.1 # Apache-2.0
 osprofiler>=3.4.0 # Apache-2.0
 Pygments>=2.7.2 # BSD license
 python-subunit>=1.4.0 # Apache-2.0/BSD
-pytz>=2020.4 # MIT
 requests-mock>=1.2.0 # Apache-2.0
 testrepository>=0.0.20 # Apache-2.0/BSD
 stestr>=3.1.0 # Apache-2.0