diff --git a/web/pgadmin/__init__.py b/web/pgadmin/__init__.py
index 538bb3a..23c1489 100644
--- a/web/pgadmin/__init__.py
+++ b/web/pgadmin/__init__.py
@@ -33,7 +33,7 @@ import config
 # If script is running under python3, it will not have the xrange function
 # defined
 winreg = None
-if sys.version_info.major >= 3:
+if sys.version_info[0] >= 3:
     xrange = range
     if os.name == 'nt':
         import winreg
@@ -247,6 +247,7 @@ def create_app(app_name=config.APP_NAME):
         '''Add a server to the config database'''
         def add_server(user_id, servergroup_id, name, superuser, port, discovery_id, comment):
         # Create a server object if needed, and store it.
+            arch_keys = set()
             servers = Server.query.filter_by(
                 user_id=user_id,
                 discovery_id=svr_discovery_id
@@ -279,12 +280,13 @@ def create_app(app_name=config.APP_NAME):
                 proc_arch64 = None
 
             if proc_arch == 'x86' and not proc_arch64:
-                arch_keys = {0}
+                arch_keys.add(0)
             elif proc_arch == 'x86' or proc_arch == 'amd64':
-                arch_keys = {winreg.KEY_WOW64_32KEY, winreg.KEY_WOW64_64KEY}
+                arch_keys.add(winreg.KEY_WOW64_32KEY)
+                arch_keys.add(winreg.KEY_WOW64_64KEY)
 
             for arch_key in arch_keys:
-                for server_type in { 'PostgreSQL', 'EnterpriseDB'}:
+                for server_type in ('PostgreSQL', 'EnterpriseDB'):
                     try:
                         root_key = winreg.OpenKey(
                             winreg.HKEY_LOCAL_MACHINE,
diff --git a/web/pgadmin/utils/driver/psycopg2/cursor.py b/web/pgadmin/utils/driver/psycopg2/cursor.py
index 1193dc4..c8257ab 100644
--- a/web/pgadmin/utils/driver/psycopg2/cursor.py
+++ b/web/pgadmin/utils/driver/psycopg2/cursor.py
@@ -130,7 +130,7 @@ class DictCursor(_cursor):
         """
         if self._odt_desc is None:
             self._ordered_description()
-        return {k[0]: v for k, v in zip(self._odt_desc, tup)}
+        return dict((k[0], v) for k, v in zip(self._odt_desc, tup))
 
     def _ordered_description(self):
         """
@@ -144,7 +144,7 @@ class DictCursor(_cursor):
             return
 
         res = list()
-        od = {d[0]: 0 for d in desc}
+        od = dict((d[0], 0) for d in desc)
         for d in desc:
             dummy = None
             idx = od[d.name]