fix Nonce type bug

@@ -48,7 +48,7 @@ class QcloudApi:
             params['Signature'] = sign
             response_dict = requests.post("https://" + req_url, data=params).json()
         elif api_version == 3:
-            public_params = {'Region': QcloudApi.Region, 'Timestamp': int(time.time()), 'Nonce': QcloudApi.generate_nonce(), 'Version': '2017-03-12', 'SecretId': self.secretId, 'SignatureMethod':'HmacSHA1'}
+            public_params = {'Region': QcloudApi.Region, 'Timestamp': int(time.time()), 'Nonce': int(QcloudApi.generate_nonce()), 'Version': '2017-03-12', 'SecretId': self.secretId, 'SignatureMethod':'HmacSHA1'}
             # merge params
             params = dict(params, **public_params)
             # signature

@@ -55,7 +55,7 @@ class consoleRobot(object):
             "Action":"TerminateInstances",
             "InstanceIds.0":instanceId
             }
-        result = self.client.do_query(params,"cvm.ap-beijing.tencentcloudapi.com")
+        result = self.client.do_query(params,"cvm.ap-beijing.tencentcloudapi.com",api_version=3)
         return result
 
     def ReturnInstanceByIp(self,privateIp):
@@ -67,11 +67,16 @@ class consoleRobot(object):
             feedBack = str(raw_input('确认?(Y/N): ')).upper()
             if feedBack == 'Y':
                 print '开始退还实例...{0}'.format(instanceId)
-                self.ReturnInstanceById(instanceId)
-                print '实例退还成功！'
-                print '开始注销zabbix host...'
-                delete_host_by_ip(privateIp)
-                return 0
+                rsp = self.ReturnInstanceById(instanceId)['Response']
+                if rsp.has_key('Error'):
+                    print json.dumps(rsp['Error'],indent=4)
+                    print '实例退还失败'
+                    return 1
+                else:
+                    print '实例退还成功！'
+                    print '开始注销zabbix host...'
+                    delete_host_by_ip(privateIp)
+                    return 0
             else:
                 print '任务取消'
                 return 0