Reverted "Fixed #27818 -- Replaced try/except/pass with contextlib.suppress()."

This reverts commit 550cb3a365
because try/except performs better.

tests/postgres_tests/test_aggregates.py

@@ -1,5 +1,4 @@
 import json
-from contextlib import suppress
 
 from django.db.models.expressions import F, Value
 from django.test.testcases import skipUnlessDBFeature
@@ -8,12 +7,14 @@ from django.test.utils import Approximate
 from . import PostgreSQLTestCase
 from .models import AggregateTestModel, StatTestModel
 
-with suppress(ImportError):  # psycopg2 is not installed
+try:
     from django.contrib.postgres.aggregates import (
         ArrayAgg, BitAnd, BitOr, BoolAnd, BoolOr, Corr, CovarPop, JSONBAgg,
         RegrAvgX, RegrAvgY, RegrCount, RegrIntercept, RegrR2, RegrSlope,
         RegrSXX, RegrSXY, RegrSYY, StatAggregate, StringAgg,
     )
+except ImportError:
+    pass  # psycopg2 is not installed
 
 
 class TestGeneralAggregate(PostgreSQLTestCase):

tests/postgres_tests/test_array.py

@@ -2,7 +2,6 @@ import decimal
 import json
 import unittest
 import uuid
-from contextlib import suppress
 
 from django import forms
 from django.core import exceptions, serializers, validators
@@ -20,11 +19,13 @@ from .models import (
     PostgreSQLModel, Tag,
 )
 
-with suppress(ImportError):
+try:
     from django.contrib.postgres.fields import ArrayField
     from django.contrib.postgres.forms import (
         SimpleArrayField, SplitArrayField, SplitArrayWidget,
     )
+except ImportError:
+    pass
 
 
 class TestSaveLoad(PostgreSQLTestCase):

tests/postgres_tests/test_hstore.py

@@ -1,5 +1,4 @@
 import json
-from contextlib import suppress
 
 from django.core import exceptions, serializers
 from django.forms import Form
@@ -8,10 +7,12 @@ from django.test.utils import modify_settings
 from . import PostgreSQLTestCase
 from .models import HStoreModel
 
-with suppress(ImportError):
+try:
     from django.contrib.postgres import forms
     from django.contrib.postgres.fields import HStoreField
     from django.contrib.postgres.validators import KeysValidator
+except ImportError:
+    pass
 
 
 @modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})

tests/postgres_tests/test_json.py

@@ -1,6 +1,5 @@
 import datetime
 import uuid
-from contextlib import suppress
 from decimal import Decimal
 
 from django.core import exceptions, serializers
@@ -12,9 +11,11 @@ from django.utils.html import escape
 from . import PostgreSQLTestCase
 from .models import JSONModel
 
-with suppress(ImportError):
+try:
     from django.contrib.postgres import forms
     from django.contrib.postgres.fields import JSONField
+except ImportError:
+    pass
 
 
 @skipUnlessDBFeature('has_jsonb_datatype')

tests/postgres_tests/test_ranges.py

@@ -1,6 +1,5 @@
 import datetime
 import json
-from contextlib import suppress
 
 from django import forms
 from django.core import exceptions, serializers
@@ -11,12 +10,14 @@ from django.utils import timezone
 from . import PostgreSQLTestCase
 from .models import RangeLookupsModel, RangesModel
 
-with suppress(ImportError):
+try:
     from psycopg2.extras import DateRange, DateTimeTZRange, NumericRange
     from django.contrib.postgres import fields as pg_fields, forms as pg_forms
     from django.contrib.postgres.validators import (
         RangeMaxValueValidator, RangeMinValueValidator,
     )
+except ImportError:
+    pass
 
 
 class TestSaveLoad(PostgreSQLTestCase):