fix pandas warning regarding chained assignment

swat/cas/table.py

@@ -3982,7 +3982,7 @@ def _topk_frequency(self, maxtie=0, skipna=True):
         out = out.drop('Rank', axis=1)
 
         if 'NumVar' in out.columns and 'CharVar' in out.columns:
-            out['NumVar'].fillna(out['CharVar'], inplace=True)
+            out.fillna({'NumVar': out['CharVar']}, inplace=True)
             out.drop('CharVar', axis=1, inplace=True)
             out.rename(columns=dict(NumVar='top'), inplace=True)
 
@@ -4379,7 +4379,7 @@ def _topk_values(self, stats=None, axis=None, skipna=True, level=None,
             minmax = pd.concat(minmax)
             minmax.loc[:, 'stat'] = ['max', 'min'] * int(len(minmax) / 2)
             if 'NumVar' in minmax.columns and 'CharVar' in minmax.columns:
-                minmax['NumVar'].fillna(minmax['CharVar'], inplace=True)
+                minmax.fillna({'NumVar': minmax['CharVar']}, inplace=True)
                 minmax.rename(columns=dict(NumVar='value', Column='column'),
                               inplace=True)
             elif 'NumVar' in minmax.columns:

swat/tests/cas/test_datamsg.py

@@ -53,11 +53,11 @@ def setUp(self):
         swat.options.interactive_mode = False
         swat.options.cas.missing.int64 = -999999
 
-        self.s = swat.CAS(HOST, PORT, USER, PASSWD, protocol=PROTOCOL)
-
-        if self.s._protocol in ['http', 'https']:
+        if PROTOCOL in ['http', 'https']:
             tm.TestCase.skipTest(self, 'REST does not support data messages')
 
+        self.s = swat.CAS(HOST, PORT, USER, PASSWD, protocol=PROTOCOL)
+
         if type(self).server_type is None:
             # Set once per class and have every test use it.
             # No need to change between tests.

swat/tests/cas/test_echo.py

@@ -42,6 +42,8 @@ def setUp(self):
 
         out = self.s.loadactionset(actionset='actionTest')
         if out.severity != 0:
+            self.s.endsession()
+            del self.s
             self.skipTest("actionTest failed to load")
 
     def tearDown(self):

swat/tests/cas/test_params.py

@@ -44,6 +44,8 @@ def setUp(self):
 
         r = self.s.loadactionset(actionset='actionTest')
         if r.severity != 0:
+            self.s.endsession()
+            del self.s
             self.skipTest("actionTest failed to load")
 
         self.s.loadactionset(actionset='simple')