Replaced cStringIO.StringIO by io.BytesIO.

Also replaced StringIO.StringIO by BytesIO in some other appropriate
places. StringIO is not available in Python 3.

tests/regressiontests/file_storage/tests.py

@@ -7,10 +7,7 @@ import shutil
 import tempfile
 import time
 from datetime import datetime, timedelta
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import BytesIO
 
 try:
     import threading
@@ -483,7 +480,7 @@ class DimensionClosingBug(unittest.TestCase):
         """
         Open files passed into get_image_dimensions() should stay opened.
         """
-        empty_io = StringIO()
+        empty_io = BytesIO()
         try:
             get_image_dimensions(empty_io)
         finally:
@@ -557,10 +554,10 @@ class NoNameFileTestCase(unittest.TestCase):
     urllib.urlopen()
     """
     def test_noname_file_default_name(self):
-        self.assertEqual(File(StringIO('A file with no name')).name, None)
+        self.assertEqual(File(BytesIO(b'A file with no name')).name, None)
 
     def test_noname_file_get_size(self):
-        self.assertEqual(File(StringIO('A file with no name')).size, 19)
+        self.assertEqual(File(BytesIO(b'A file with no name')).size, 19)
 
 class FileLikeObjectTestCase(LiveServerBase):
     """

tests/regressiontests/fixtures_regress/tests.py

@@ -4,10 +4,7 @@ from __future__ import absolute_import
 
 import os
 import re
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import BytesIO
 
 from django.core import management
 from django.core.management.base import CommandError
@@ -119,7 +116,7 @@ class TestFixtures(TestCase):
         Test for ticket #4371 -- Loading data of an unknown format should fail
         Validate that error conditions are caught correctly
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'bad_fixture1.unkn',
@@ -138,7 +135,7 @@ class TestFixtures(TestCase):
         using explicit filename.
         Validate that error conditions are caught correctly
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'bad_fixture2.xml',
@@ -157,7 +154,7 @@ class TestFixtures(TestCase):
         without file extension.
         Validate that error conditions are caught correctly
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'bad_fixture2',
@@ -175,7 +172,7 @@ class TestFixtures(TestCase):
         Test for ticket #4371 -- Loading a fixture file with no data returns an error.
         Validate that error conditions are caught correctly
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'empty',
@@ -194,7 +191,7 @@ class TestFixtures(TestCase):
         loading is aborted.
         Validate that error conditions are caught correctly
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'empty',
@@ -211,7 +208,7 @@ class TestFixtures(TestCase):
         """
         (Regression for #9011 - error message is correct)
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'bad_fixture2',
@@ -317,7 +314,7 @@ class TestFixtures(TestCase):
         )
         animal.save()
 
-        stdout = StringIO()
+        stdout = BytesIO()
         management.call_command(
             'dumpdata',
             'fixtures_regress.animal',
@@ -346,7 +343,7 @@ class TestFixtures(TestCase):
         """
         Regression for #11428 - Proxy models aren't included when you dumpdata
         """
-        stdout = StringIO()
+        stdout = BytesIO()
         # Create an instance of the concrete class
         widget = Widget.objects.create(name='grommet')
         management.call_command(
@@ -379,7 +376,7 @@ class TestFixtures(TestCase):
         """
         Regression for #3615 - Ensure data with nonexistent child key references raises error
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             'forward_ref_bad_data.json',
@@ -414,7 +411,7 @@ class TestFixtures(TestCase):
         """
         Regression for #7043 - Error is quickly reported when no fixtures is provided in the command line.
         """
-        stderr = StringIO()
+        stderr = BytesIO()
         management.call_command(
             'loaddata',
             verbosity=0,
@@ -426,7 +423,7 @@ class TestFixtures(TestCase):
         )
 
     def test_loaddata_not_existant_fixture_file(self):
-        stdout_output = StringIO()
+        stdout_output = BytesIO()
         management.call_command(
             'loaddata',
             'this_fixture_doesnt_exist',
@@ -511,7 +508,7 @@ class NaturalKeyFixtureTests(TestCase):
             commit=False
             )
 
-        stdout = StringIO()
+        stdout = BytesIO()
         management.call_command(
             'dumpdata',
             'fixtures_regress.book',

tests/regressiontests/i18n/commands/compilation.py

@@ -1,8 +1,5 @@
 import os
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import BytesIO
 
 from django.core.management import CommandError
 from django.core.management.commands.compilemessages import compile_messages
@@ -31,7 +28,7 @@ class PoFileTests(MessageCompilationTests):
         # We don't use the django.core.management infrastructure (call_command()
         # et al) because CommandError's cause exit(1) there. We test the
         # underlying compile_messages function instead
-        out = StringIO()
+        out = BytesIO()
         self.assertRaises(CommandError, compile_messages, out, locale=self.LOCALE)
         self.assertFalse(os.path.exists(self.MO_FILE))
 
@@ -51,7 +48,7 @@ class PoFileContentsTests(MessageCompilationTests):
         # We don't use the django.core.management infrastructure (call_command()
         # et al) because CommandError's cause exit(1) there. We test the
         # underlying compile_messages function instead
-        out = StringIO()
+        out = BytesIO()
         compile_messages(out, locale=self.LOCALE)
         self.assertTrue(os.path.exists(self.MO_FILE))
 
@@ -70,7 +67,7 @@ class PercentRenderingTests(MessageCompilationTests):
         # We don't use the django.core.management infrastructure (call_command()
         # et al) because CommandError's cause exit(1) there. We test the
         # underlying compile_messages function instead
-        out = StringIO()
+        out = BytesIO()
         compile_messages(out, locale=self.LOCALE)
         with translation.override(self.LOCALE):
             t = Template('{% load i18n %}{% trans "Looks like a str fmt spec %% o but shouldn\'t be interpreted as such" %}')

tests/regressiontests/m2m_through_regress/tests.py

@@ -1,9 +1,6 @@
 from __future__ import absolute_import
 
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import BytesIO
 
 from django.core import management
 from django.contrib.auth.models import User
@@ -73,11 +70,11 @@ class M2MThroughTestCase(TestCase):
 
         pks = {"p_pk": p.pk, "g_pk": g.pk, "m_pk": m.pk}
 
-        out = StringIO()
+        out = BytesIO()
         management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out)
         self.assertEqual(out.getvalue().strip(), """[{"pk": %(m_pk)s, "model": "m2m_through_regress.membership", "fields": {"person": %(p_pk)s, "price": 100, "group": %(g_pk)s}}, {"pk": %(p_pk)s, "model": "m2m_through_regress.person", "fields": {"name": "Bob"}}, {"pk": %(g_pk)s, "model": "m2m_through_regress.group", "fields": {"name": "Roll"}}]""" % pks)
 
-        out = StringIO()
+        out = BytesIO()
         management.call_command("dumpdata", "m2m_through_regress", format="xml",
             indent=2, stdout=out)
         self.assertEqual(out.getvalue().strip(), """
@@ -145,6 +142,6 @@ class ThroughLoadDataTestCase(TestCase):
 
     def test_sequence_creation(self):
         "Check that sequences on an m2m_through are created for the through model, not a phantom auto-generated m2m table. Refs #11107"
-        out = StringIO()
+        out = BytesIO()
         management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out)
         self.assertEqual(out.getvalue().strip(), """[{"pk": 1, "model": "m2m_through_regress.usermembership", "fields": {"price": 100, "group": 1, "user": 1}}, {"pk": 1, "model": "m2m_through_regress.person", "fields": {"name": "Guido"}}, {"pk": 1, "model": "m2m_through_regress.group", "fields": {"name": "Python Core Group"}}]""")

tests/regressiontests/serializers_regress/tests.py

@@ -10,10 +10,7 @@ from __future__ import absolute_import
 
 import datetime
 import decimal
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import BytesIO
 
 try:
     import yaml
@@ -504,7 +501,7 @@ def streamTest(format, self):
     obj.save_base(raw=True)
 
     # Serialize the test database to a stream
-    stream = StringIO()
+    stream = BytesIO()
     serializers.serialize(format, [obj], indent=2, stream=stream)
 
     # Serialize normally for a comparison