      """
      Supplement existing urlpatterns with corrosponding patterns that also
      include a '.format' suffix.  Retains urlpattern ordering.
  
      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']
 
</s> remove     suffix_kwarg:
        The name of the kwarg that will be passed to the view.
        Defaults to 'format'.

 </s> add  </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):
    urlpatterns:
        A list of URL patterns.

      """
      Supplement existing urlpatterns with corrosponding patterns that also
      include a '.format' suffix.  Retains urlpattern ordering.
  
    urlpatterns:
        A list of URL patterns.

      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']
keep keep keep add keep keep keep keep keep keep
 docs, docs, docs, docs, docs, docs, docs 
rest_framework/urlpatterns.py