chore: Django3 has removed python_2_unicode_compatible.

Execute the codemodes.

lms/djangoapps/instructor_task/subtasks.py

@@ -14,7 +14,7 @@ import psutil
 from celery.states import READY_STATES, RETRY, SUCCESS
 from django.core.cache import cache
 from django.db import DatabaseError, transaction
-from django.utils.encoding import python_2_unicode_compatible
+
 
 from common.djangoapps.util.db import outer_atomic
 
@@ -120,7 +120,6 @@ def _generate_items_for_subtask(
         TASK_LOG.info("Number of items generated by chunking %s not equal to original total %s", num_items_queued, total_num_items)  # lint-amnesty, pylint: disable=line-too-long
 
 
-@python_2_unicode_compatible
 class SubtaskStatus:
     """
     Create and return a dict for tracking the status of a subtask.

lms/djangoapps/mobile_api/models.py

@@ -5,7 +5,7 @@ ConfigurationModel for the mobile_api djangoapp.
 
 from config_models.models import ConfigurationModel
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
+
 
 from . import utils
 from .mobile_platform import PLATFORM_CLASSES
@@ -36,7 +36,6 @@ class MobileApiConfig(ConfigurationModel):
         return [profile.strip() for profile in cls.current().video_profiles.split(",") if profile]
 
 
-@python_2_unicode_compatible
 class AppVersionConfig(models.Model):
     """
     Configuration for mobile app versions available.

lms/djangoapps/rss_proxy/models.py

@@ -2,11 +2,10 @@
 Models for the rss_proxy djangoapp.
 """
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
+
 from model_utils.models import TimeStampedModel
 
 
-@python_2_unicode_compatible
 class WhitelistedRssUrl(TimeStampedModel):
     """
     Model for persisting RSS feed URLs which are whitelisted

lms/djangoapps/survey/models.py

@@ -8,7 +8,7 @@ from collections import OrderedDict
 
 from django.core.exceptions import ValidationError
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
+
 from lxml import etree
 from model_utils.models import TimeStampedModel
 from opaque_keys.edx.django.models import CourseKeyField
@@ -20,7 +20,6 @@ from openedx.core.djangolib.markup import HTML
 log = logging.getLogger("edx.survey")
 
 
-@python_2_unicode_compatible
 class SurveyForm(TimeStampedModel):
     """
     Model to define a Survey Form that contains the HTML form data

lms/djangoapps/teams/models.py

@@ -11,7 +11,7 @@ from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imp
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import models
 from django.dispatch import receiver
-from django.utils.encoding import python_2_unicode_compatible
+
 from django.utils.text import slugify
 from django.utils.translation import ugettext_lazy
 from django_countries.fields import CountryField
@@ -104,7 +104,6 @@ def utc_now():
     return datetime.utcnow().replace(tzinfo=pytz.utc)
 
 
-@python_2_unicode_compatible
 class CourseTeam(models.Model):
     """
     This model represents team related info.
@@ -224,7 +223,6 @@ class CourseTeam(models.Model):
         self.save()
 
 
-@python_2_unicode_compatible
 class CourseTeamMembership(models.Model):
     """
     This model represents the membership of a single user in a single team.

lms/djangoapps/verify_student/models.py

@@ -25,7 +25,7 @@ from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imp
 from django.core.files.base import ContentFile
 from django.db import models, transaction
 from django.urls import reverse
-from django.utils.encoding import python_2_unicode_compatible
+
 from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy
@@ -158,7 +158,6 @@ class IDVerificationAttempt(StatusModel):
         )
 
 
-@python_2_unicode_compatible
 class ManualVerification(IDVerificationAttempt):
     """
     Each ManualVerification represents a user's verification that bypasses the need for
@@ -193,7 +192,6 @@ class ManualVerification(IDVerificationAttempt):
         return False
 
 
-@python_2_unicode_compatible
 class SSOVerification(IDVerificationAttempt):
     """
     Each SSOVerification represents a Student's attempt to establish their identity