Fix lint errors

src/drf_yasg/codecs.py

@@ -1,3 +1,5 @@
+from six import binary_type, raise_from, text_type
+
 import copy
 import json
 import logging
@@ -6,8 +8,6 @@ from collections import OrderedDict
 from coreapi.compat import force_bytes
 from ruamel import yaml
 
-from six import binary_type, raise_from, text_type
-
 from . import openapi
 from .errors import SwaggerValidationError
 

src/drf_yasg/utils.py

@@ -375,14 +375,16 @@ def get_consumes(parser_classes):
     parser_classes = [pc for pc in parser_classes if not issubclass(pc, FileUploadParser)]
     media_types = [parser.media_type for parser in parser_classes or []]
     non_form_media_types = [encoding for encoding in media_types if not is_form_media_type(encoding)]
-    # Because some data to parse could be nested array and are not supported by form media type like multipart/form-data,
+    # Because swagger Parameter objects don't support complex data types (nested objects, arrays),
-    # we must be sure to have explicit form media types **only**.
+    # we can't use those unless we are sure the view *only* accepts form data
+    # This means that a view won't support file upload in swagger unless it explicitly
+    # sets its parser classes to include only form parsers
     if len(non_form_media_types) == 0:
         return media_types
-    # Otherwise, enforce a media type like application/json to be able to parse nested array, but it won't be able to
+
-    # support file upload...
+    # If the form accepts both form data and another type, like json (which is the default config),
-    else:
+    # we will render its input as a Schema and thus it file parameters will be read-only
-        return non_form_media_types
+    return non_form_media_types
 
 
 def get_produces(renderer_classes):

tests/test_schema_generator.py

@@ -7,11 +7,11 @@ from django.conf.urls import url
 from django.contrib.postgres import fields as postgres_fields
 from django.db import models
 from django.utils.inspect import get_func_args
+from django_fake_model import models as fake_models
 from rest_framework import routers, serializers, viewsets
 from rest_framework.decorators import api_view
 from rest_framework.response import Response
 
-from django_fake_model import models as fake_models
 from drf_yasg import codecs, openapi
 from drf_yasg.codecs import yaml_sane_load
 from drf_yasg.errors import SwaggerGenerationError
@@ -347,6 +347,7 @@ EXPECTED_DESCRIPTION = """\
     You can log in using the pre-existing `admin` user with password `passwordadmin`.
 """
 
+
 def test_multiline_strings(call_generate_swagger):
     output = call_generate_swagger(format='yaml')
     print("|\n|".join(output.splitlines()[:20]))