      EmailValidator, MinValueValidator, MaxValueValidator,
      MinLengthValidator, MaxLengthValidator, URLValidator, OrderedDict,
      unicode_repr, unicode_to_repr, parse_duration, duration_string,
  )
  from rest_framework.exceptions import ValidationError
  from rest_framework.settings import api_settings
  from rest_framework.utils import html, representation, humanize_datetime
  import collections
  import copy
  import datetime
  import decimal
  import inspect
  import re
  import uuid
  
  
  class empty:
      """
      This class is used to represent no data being provided for a given input
 
</s> remove from django.utils.dateparse import parse_date, parse_datetime, parse_time
from django.utils.encoding import is_protected_type, smart_text
from django.utils.translation import ugettext_lazy as _
 </s> add  </s> remove import datetime
import decimal
import json
import uuid
 </s> add 
      EmailValidator, MinValueValidator, MaxValueValidator,
      MinLengthValidator, MaxLengthValidator, URLValidator, OrderedDict,
      unicode_repr, unicode_to_repr, parse_duration, duration_string,
  )










  
  
  class empty:
      """
      This class is used to represent no data being provided for a given input
keep keep keep keep replace replace replace replace replace replace replace replace replace replace keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/fields.py