      suffix_required:
          If `True`, only suffixed URLs will be generated, and non-suffixed
          URLs will not be used.  Defaults to `False`.
  
      suffix_kwarg:
          The name of the kwarg that will be passed to the view.
          Defaults to 'format'.
  
      allowed:
          An optional tuple/list of allowed suffixes.  eg ['json', 'api']
          Defaults to `None`, which allows any suffix.
  
      """
 
</s> remove     suffix_kwarg = suffix_kwarg or api_settings.FORMAT_SUFFIX_KWARG
 </s> add     suffix_kwarg = api_settings.FORMAT_SUFFIX_KWARG </s> remove def format_suffix_patterns(urlpatterns, suffix_required=False,
                           suffix_kwarg=None, allowed=None):
 </s> add def format_suffix_patterns(urlpatterns, suffix_required=False, allowed=None):
      suffix_required:
          If `True`, only suffixed URLs will be generated, and non-suffixed
          URLs will not be used.  Defaults to `False`.
  




      allowed:
          An optional tuple/list of allowed suffixes.  eg ['json', 'api']
          Defaults to `None`, which allows any suffix.
  
      """
keep keep keep keep replace replace replace replace keep keep keep keep keep
 docs, docs, docs, docs, docs, docs, docs 
rest_framework/urlpatterns.py