diff --git a/src/drf_yasg/generators.py b/src/drf_yasg/generators.py
index c806143..c087e10 100644
--- a/src/drf_yasg/generators.py
+++ b/src/drf_yasg/generators.py
@@ -95,7 +95,7 @@ class EndpointEnumerator(_EndpointEnumerator):
                         for method in self.get_allowed_methods(callback):
                             endpoint = (path, method, callback)
                             api_endpoints.append(endpoint)
-                except Exception:
+                except Exception:  # pragma: no cover
                     logger.warning('failed to enumerate view', exc_info=True)
 
             elif isinstance(pattern, URLResolver):
diff --git a/src/drf_yasg/inspectors/field.py b/src/drf_yasg/inspectors/field.py
index 42101ec..1ee2178 100644
--- a/src/drf_yasg/inspectors/field.py
+++ b/src/drf_yasg/inspectors/field.py
@@ -529,7 +529,7 @@ else:
 
 try:
     from rest_framework_recursive.fields import RecursiveField
-except ImportError:
+except ImportError:  # pragma: no cover
     class RecursiveFieldInspector(FieldInspector):
         """Provides conversion for RecursiveField (https://github.com/heywbj/django-rest-framework-recursive)"""
         pass
diff --git a/src/drf_yasg/renderers.py b/src/drf_yasg/renderers.py
index ecc66a8..b58f4a2 100644
--- a/src/drf_yasg/renderers.py
+++ b/src/drf_yasg/renderers.py
@@ -23,7 +23,7 @@ class _SpecRenderer(BaseRenderer):
         assert self.codec_class, "must override codec_class"
         codec = self.codec_class(self.validators)
 
-        if not isinstance(data, Swagger):
+        if not isinstance(data, Swagger):  # pragma: no cover
             # if `swagger` is not a ``Swagger`` object, it means we somehow got a non-success ``Response``
             # in that case, it's probably better to let the default ``TemplateHTMLRenderer`` render it
             # see https://github.com/axnsan12/drf-yasg/issues/58
@@ -59,7 +59,7 @@ class _UIRenderer(BaseRenderer):
     template = ''
 
     def render(self, swagger, accepted_media_type=None, renderer_context=None):
-        if not isinstance(swagger, Swagger):
+        if not isinstance(swagger, Swagger):  # pragma: no cover
             # if `swagger` is not a ``Swagger`` object, it means we somehow got a non-success ``Response``
             # in that case, it's probably better to let the default ``TemplateHTMLRenderer`` render it
             # see https://github.com/axnsan12/drf-yasg/issues/58