diff --git a/Src/datToVTP.py b/Src/datToVTP.py
index d505793..8a01396 100644
--- a/Src/datToVTP.py
+++ b/Src/datToVTP.py
@@ -62,7 +62,7 @@ def ReadNodes(Nnodes,Nscalars,varnames,f):
     for i in range(Nnodes):
         line = f.readline().strip(' \n')
         d = line.split(' ')
-        d = [ x for x in d if x is not '' ]
+        d = [ x for x in d if x != '' ]
         Nscalars_this = len(d) - 3
         if Nscalars != Nscalars_this:
             print('Number of scalars inconsistent across points '+str(Nscalars)+' vs '+str(Nscalars_this))
diff --git a/Src/datToView.py b/Src/datToView.py
index d4e14ce..ef578f8 100644
--- a/Src/datToView.py
+++ b/Src/datToView.py
@@ -62,7 +62,7 @@ def ReadNodes(Nnodes,Nscalars,varnames,f):
     for i in range(Nnodes):
         line = f.readline().strip(' \n')
         d = line.split(' ')
-        d = [ x for x in d if x is not '' ]
+        d = [ x for x in d if x != '' ]
         Nscalars_this = len(d) - 3
         if Nscalars != Nscalars_this:
             print('Number of scalars inconsistent across points '+str(Nscalars)+' vs '+str(Nscalars_this))