added test case for 500 response of python client

modules/swagger-codegen/src/main/resources/python/rest.mustache

@@ -190,7 +190,10 @@ class ApiException(Exception):
         """
         Custom error response messages
         """
-        return "({0})\nReason: {1}\nHeader: {2}\nBody: {3}\n".\
+        return "({0})\n"\
+            "Reason: {1}\n"\
+            "HTTP response headers: {2}\n"\
+            "HTTP response body: {3}\n".\
             format(self.status, self.reason, self.headers, self.body)
 
 class RESTClient(object):

modules/swagger-codegen/src/main/resources/python/util.mustache

@@ -1,6 +1,12 @@
+# coding: utf-8
+
 from six import iteritems
 
 def remove_none(obj):
+    """
+    Remove None from `list`, `tuple`, `set`.
+    Remove None value from `dict`.
+    """
     if isinstance(obj, (list, tuple, set)):
         return type(obj)(remove_none(x) for x in obj if x is not None)
     elif isinstance(obj, dict):
@@ -8,10 +14,3 @@ def remove_none(obj):
                          for k, v in iteritems(obj) if k is not None and v is not None)
     else:
         return obj
-
-
-def inspect_vars(obj):
-    if not hasattr(obj, '__dict__'):
-        return obj
-    else:
-        return {k: inspect_vars(getattr(obj, k)) for k in dir(obj)}