def parse_vnfd(csar_id, inputs):
-    ret= None
+    ret = None
     try:
         nf_pkg = VnfPackageModel.objects.filter(vnfPackageId=csar_id)
         if not nf_pkg:
 
         JobUtil.add_job_status(self.job_id, 100, "CSAR(%s) distribute successfully." % self.csar_id)
 
-
     def rollback_distribute(self):
         try:
             VnfPackageModel.objects.filter(vnfPackageId=self.csar_id).delete()
 
 
 
 def parse_nsd(csar_id, inputs):
-    ret= None
+    ret = None
     try:
         ns_pkg = NSPackageModel.objects.filter(nsPackageId=csar_id)
         if not ns_pkg:
 
             valid_params = self._validate_input_params(file_name, params)
             return self._create_tosca_template(file_name, valid_params)
         finally:
-            if file_name != None and file_name != path and os.path.exists(file_name):
+            if file_name is not None and file_name != path and os.path.exists(file_name):
                 try:
                     os.remove(file_name)
                 except Exception as e:
             print "-----------------------------"
             return tosca_tpl
         finally:
-            if tosca_tpl != None and hasattr(tosca_tpl, "temp_dir") and os.path.exists(tosca_tpl.temp_dir):
+            if tosca_tpl is not None and hasattr(tosca_tpl, "temp_dir") and os.path.exists(tosca_tpl.temp_dir):
                 try:
                     shutil.rmtree(tosca_tpl.temp_dir)
                 except Exception as e:
             sftp = paramiko.SFTPClient.from_transport(t)
             sftp.get(remoteFileName, localFileName)
         finally:
-            if t != None:
+            if t is not None:
                 t.close()
 
-
     def ftp_get(self, userName, userPwd, hostIp, hostPort, remoteFileName, localFileName):
         f = None
         try:
             ftp.retrbinary('RETR ' + remoteFileName, f.write, 1024)
             f.close()
         finally:
-            if f != None:
+            if f is not None:
                 f.close()
 
     def buidMetadata(self, tosca):
                 properties[k] = str(item)
         return properties
 
-
     def verify_properties(self, props, inputs, parsed_params):
         ret_props = {}
         if (props and len(props) > 0):
         capabilities = json.dumps(nodeTemplate.entity_tpl.get('capabilities', None))
         match = re.findall(r'\{"get_input":\s*"([\w|\-]+)"\}',capabilities)
         for m in match:
-            aa= [input_def for input_def in inputs
+            aa = [input_def for input_def in inputs
                  if m == input_def.name][0]
             capabilities = re.sub(r'\{"get_input":\s*"([\w|\-]+)"\}', json.dumps(aa.default), capabilities,1)
         if capabilities != 'null':
         artifacts = json.dumps(nodeTemplate.entity_tpl.get('artifacts', None))
         match = re.findall(r'\{"get_input":\s*"([\w|\-]+)"\}',artifacts)
         for m in match:
-            aa= [input_def for input_def in inputs
+            aa = [input_def for input_def in inputs
                  if m == input_def.name][0]
             artifacts = re.sub(r'\{"get_input":\s*"([\w|\-]+)"\}', json.dumps(aa.default), artifacts,1)
         if artifacts != 'null':
     def getVirtualbindings(self, node):
         return self.getRequirementByName(node, 'virtualbinding')
 
-
     def getRequirementByName(self, node, requirementName):
         requirements = []
         if 'requirements' in node:
         if 'requirements' in node:
             for item in node['requirements']:
                 for key, value in item.items():
-                    if key.upper().find('VIRTUALLINK') >=0:
+                    if key.upper().find('VIRTUALLINK') >= 0:
                         rets.append({"key_name":key, "vl_id":self.get_requirement_node_name(value)})
         return rets
 
 
         self.ns_flavours = self.get_all_flavour(tosca.topology_template.groups)
         self.nested_ns = self.get_all_nested_ns(nodeTemplates)
 
-
     def buildInputs(self, top_inputs):
         ret = {}
         for tmpinput in top_inputs:
         return ret
 
     def buildNode(self, nodeTemplate, inputs, parsed_params):
-        ret ={}
+        ret = {}
         ret['name'] = nodeTemplate.name
         ret['nodeType'] = nodeTemplate.type
         if 'description' in nodeTemplate.entity_tpl:
         self.buildCapabilities(nodeTemplate, inputs, ret)
         self.buildArtifacts(nodeTemplate, inputs, ret)
         interfaces = self.build_interfaces(nodeTemplate)
-        if interfaces: ret['interfaces'] = interfaces
+        if interfaces:
+            ret['interfaces'] = interfaces
         return ret
 
     def _get_all_vnf(self, nodeTemplates):
                     for key, value in item.items():
                         if key.upper().startswith('VIRTUALBINDING'):
                             req_node_name = self.get_requirement_node_name(value)
-                            if req_node_name != None and req_node_name == node['name']:
+                            if req_node_name is not None and req_node_name == node['name']:
                                 cps.append(tmpnode)
         return cps
 
         cp_vl = {}
         cp_vl['vl_id'] = self.get_prop_from_obj(req, 'node')
         relationship = self.get_prop_from_obj(req, 'relationship')
-        if relationship != None:
+        if relationship is not None:
             properties = self.get_prop_from_obj(relationship, 'properties')
-            if properties != None and isinstance(properties, dict):
+            if properties is not None and isinstance(properties, dict):
                 for key, value in properties.items():
                     cp_vl[key] = value
         return cp_vl
 
         self.vnf_exposed = self.get_all_endpoint_exposed(tosca.topology_template)
         self.vnf_flavours = self.get_all_flavour(tosca.topology_template.groups)
 
-
     def _get_all_services(self, nodeTemplates):
         ret = []
         for node in nodeTemplates:
                 ret['dependencies'] = map(lambda x: self.get_requirement_node_name(x), self.getNodeDependencys(node))
 
                 nfv_compute = self.getCapabilityByName(node, 'nfv_compute')
-                if nfv_compute != None and 'properties' in nfv_compute:
+                if nfv_compute is not None and 'properties' in nfv_compute:
                     ret['nfv_compute'] = nfv_compute['properties']
 
                 ret['vls'] = self.get_linked_vl_ids(node, nodeTemplates)
 
                 scalable = self.getCapabilityByName(node, 'scalable')
-                if scalable != None and 'properties' in scalable:
+                if scalable is not None and 'properties' in scalable:
                     ret['scalable'] = scalable['properties']
 
                 ret['cps'] = self.getVirtalBindingCpIds(node, nodeTemplates)
 
 downloadcache = ~/cache/pip
 
 [flake8]
-ignore = E501,E231,E128,W291,W293,E711,E303,E701,E225,E303
+ignore = E501,E231,E128,W291,W293
 exclude =  ./venv-tox,./.tox
 
 [testenv]