chore: Removed python_2_unicode_compatible decorator. (#28342)

* chore: Removed python_2_unicode_compatible decorator.

common/lib/capa/capa/capa_problem.py

@@ -23,7 +23,7 @@ from datetime import datetime
 from xml.sax.saxutils import unescape
 
 import six
-from django.utils.encoding import python_2_unicode_compatible
+
 from lxml import etree
 from pytz import UTC
 
@@ -128,7 +128,6 @@ class LoncapaSystem(object):
         self.matlab_api_key = matlab_api_key
 
 
-@python_2_unicode_compatible
 class LoncapaProblem(object):
     """
     Main class for capa Problems.

common/lib/capa/capa/inputtypes.py

@@ -53,7 +53,7 @@ import pyparsing
 import six
 from calc.preview import latex_preview
 from chem import chemcalc
-from django.utils.encoding import python_2_unicode_compatible
+
 from lxml import etree
 from six import text_type
 
@@ -73,7 +73,6 @@ log = logging.getLogger(__name__)
 registry = TagRegistry()  # pylint: disable=invalid-name
 
 
-@python_2_unicode_compatible
 class Status(object):
     """
     Problem status

common/lib/capa/capa/responsetypes.py

@@ -34,7 +34,7 @@ import six
 # specific library imports
 from calc import UndefinedVariable, UnmatchedParenthesis, evaluator
 from django.utils import html
-from django.utils.encoding import python_2_unicode_compatible
+
 from lxml import etree
 from lxml.html.soupparser import fromstring as fromstring_bs  # uses Beautiful Soup!!! FIXME?
 from pyparsing import ParseException
@@ -110,7 +110,6 @@ class StudentInputError(Exception):
 # Main base class for CAPA responsetypes
 
 
-@python_2_unicode_compatible
 class LoncapaResponse(six.with_metaclass(abc.ABCMeta, object)):
     """
     Base class for CAPA responsetypes.  Each response type (ie a capa question,