fixed bug ERROR:root:module 'typing' has no attribute 'GenericMeta'

sure_tosca-flask-server/.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.6 (sure_tosca-flask-server)" project-jdk-type="Python SDK" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.7 (sure_tosca-flask-server)" project-jdk-type="Python SDK" />
   <component name="PyCharmProfessionalAdvertiser">
     <option name="shown" value="true" />
   </component>

sure_tosca-flask-server/.idea/sure_tosca-flask-server.iml

 <?xml version="1.0" encoding="UTF-8"?>
 <module type="PYTHON_MODULE" version="4">
   <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
-    <orderEntry type="jdk" jdkName="Python 3.6 (sure_tosca-flask-server)" jdkType="Python SDK" />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/venv" />
+    </content>
+    <orderEntry type="jdk" jdkName="Python 3.7 (sure_tosca-flask-server)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
   <component name="TestRunnerService">

sure_tosca-flask-server/sure_tosca/util.py

@@ -23,10 +23,10 @@ def _deserialize(data, klass):
         return deserialize_date(data)
     elif klass == datetime.datetime:
         return deserialize_datetime(data)
-    elif type(klass) == typing.GenericMeta:
-        if klass.__extra__ == list:
+    elif hasattr(klass, '__origin__'):
+        if klass.__origin__ == list:
             return _deserialize_list(data, klass.__args__[0])
-        if klass.__extra__ == dict:
+        if klass.__origin__ == dict:
             return _deserialize_dict(data, klass.__args__[1])
     else:
         return deserialize_model(data, klass)