  
  from rest_framework.compat import get_user_model
  
  
  def get_authorization_header(request):
      """
      Return request's 'Authorization:' header, as a bytestring.
 
</s> remove from rest_framework import exceptions, HTTP_HEADER_ENCODING
from rest_framework.authtoken.models import Token
 </s> add  </s> remove import sys
import warnings
 </s> add  </s> remove import math
 </s> add  </s> remove from rest_framework.utils import formatting
import inspect
import warnings
 </s> add from rest_framework.compat import HttpResponseBase, View, set_rollback
from rest_framework.authtoken.models import Token
from rest_framework import exceptions, HTTP_HEADER_ENCODING
  
  from rest_framework.compat import get_user_model
from rest_framework.authtoken.models import Token
from rest_framework import exceptions, HTTP_HEADER_ENCODING
  
  
  def get_authorization_header(request):
      """
      Return request's 'Authorization:' header, as a bytestring.
keep add keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/authentication.py