  from django.conf import settings
  from django.contrib.admindocs.views import simplify_regex
  from django.core.urlresolvers import RegexURLPattern, RegexURLResolver
  from django.utils import six
  
  from rest_framework import exceptions, serializers
  from rest_framework.compat import coreapi, uritemplate, urlparse
  from rest_framework.request import clone_request
  from rest_framework.views import APIView
 
</s> remove                             coreapi.Field('a', required=False, location='form'),
 </s> add                             coreapi.Field('a', required=False, location='form', description='A field description'), </s> remove                             coreapi.Field('a', required=True, location='form'),
 </s> add                             coreapi.Field('a', required=True, location='form', description='A field description'), </s> remove                             coreapi.Field('a', required=True, location='form'),
 </s> add                             coreapi.Field('a', required=True, location='form', description='A field description'), </s> remove     a = serializers.CharField(required=True)
 </s> add     a = serializers.CharField(required=True, help_text='A field description') </s> remove             field = coreapi.Field(name=field.source, location='form', required=required)
 </s> add             description = force_text(field.help_text) if field.help_text else ''
            field = coreapi.Field(
                name=field.source,
                location='form',
                required=required,
                description=description
            )
from django.utils.encoding import force_text
  from django.conf import settings
  from django.contrib.admindocs.views import simplify_regex
  from django.core.urlresolvers import RegexURLPattern, RegexURLResolver
  from django.utils import six
from django.utils.encoding import force_text
  
  from rest_framework import exceptions, serializers
  from rest_framework.compat import coreapi, uritemplate, urlparse
  from rest_framework.request import clone_request
  from rest_framework.views import APIView
keep keep keep add keep keep keep keep keep
 Add form field descriptions to schemas (#4387) 
rest_framework/schemas.py