diff --git a/.gitignore b/.gitignore
index 20fa5360..75ada38e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,5 @@ parsetab.py
 dist/
 build/
 runtime/
+.gitconfig
+.idea/
diff --git a/smop/Makefile b/smop/Makefile
index 69938b79..f6e516cd 100644
--- a/smop/Makefile
+++ b/smop/Makefile
@@ -1,10 +1,10 @@
-# for py3: make PYTHON=python3 CYTHON="cython -3" V=3
+# for py2: make PYTHON=python CYTHON="cython" V=2.7
 
 OCTAVE = /home/lei/octave-4.0.2
 SCRIPTS = $(OCTAVE)/scripts/specfun
 
-CYTHON = cython
-PYTHON = python
+CYTHON = cython -3
+PYTHON = python3
 XFILES = -x inputParser.m,dblquad.m,triplequad.m
 
 COVERAGE = python3 -m coverage
diff --git a/smop/callgraph.py b/smop/callgraph.py
index 350bf154..35bd9f9e 100644
--- a/smop/callgraph.py
+++ b/smop/callgraph.py
@@ -26,6 +26,6 @@ def callgraph(G, stmt_list):
     #nx.write_dot(G,"G.dot")
     #for u in G.nodes():
     #    if G.out_degree(u) == 0:
-    #        print u
+    #        print(u)
 if __name__ == '__main__':
     main()
diff --git a/smop/libsmop.py b/smop/libsmop.py
index 06acd2bf..0a4654ff 100644
--- a/smop/libsmop.py
+++ b/smop/libsmop.py
@@ -396,7 +396,7 @@ def deal(a,**kwargs):
     return tuple([ai for ai in a.flat])
 
 def disp(*args):
-    print (args)
+    print(args)
 
 def eig(a):
     u,v = np.linalg.eig(a)
diff --git a/smop/parse.py b/smop/parse.py
index 289a7487..6911490d 100644
--- a/smop/parse.py
+++ b/smop/parse.py
@@ -664,7 +664,7 @@ def p_persistent_stmt(p):
 #    else:
 #    assert p[2].__class__ in (node.let,node.ident), p[2].__class__
 #    p[0] = p[2]
-#    #print p[2]
+#    #print(p[2])
 
 
 @exceptions
@@ -739,7 +739,7 @@ def p_stmt(p):
     """
     # END_STMT is intentionally left out
     p[0] = p[1]
-    # print p[0]
+    # print(p[0])
 
 
 @exceptions
@@ -830,7 +830,7 @@ def p_error(p):
     if p is None:
         raise_exception(SyntaxError, "Unexpected EOF", new_lexer)
     if p.type == "COMMENT":
-        # print "Discarded comment", p.value
+        # print("Discarded comment", p.value)
         parser.errok()
         return
     raise_exception(SyntaxError,
@@ -869,5 +869,5 @@ def parse(buf):
 #
 #    if "2" in options.debug:
 #        for i,pi in enumerate(p):
-#            print i,pi.__class__.__name__,str(pi)[:50]
+#            print(i,pi.__class__.__name__,str(pi)[:50])
 
diff --git a/smop/resolve.py b/smop/resolve.py
index 1e4b16f6..3171b558 100644
--- a/smop/resolve.py
+++ b/smop/resolve.py
@@ -51,19 +51,19 @@ def resolve(t, symtab=None, fp=None, func_name=None):
     G = as_networkx(t)
     for n in G.nodes():
         print(n.__class__.__name__)
-        u = G.node[n]["ident"]
+        u = G.nodes[n]["ident"]
         if u.props:
             pass
         elif G.out_edges(n) and G.in_edges(n):
             u.props = "U" # upd
-            #print u.name, u.lineno, u.column
+            #print(u.name, u.lineno, u.column)
         elif G.in_edges(n):
             u.props = "D" # def
         elif G.out_edges(n):
             u.props = "R" # ref
         else:
             u.props = "F" # ???
-        G.node[n]["label"] = "%s\\n%s" % (n, u.props)
+        G.nodes[n]["label"] = "%s\\n%s" % (n, u.props)
     return G
 
 def do_resolve(t,symtab):
diff --git a/smop/rewrite.py b/smop/rewrite.py
index f32f6422..c17ae9bb 100644
--- a/smop/rewrite.py
+++ b/smop/rewrite.py
@@ -84,7 +84,7 @@ def let_statement(u):
 #            for nodename in component:
 #                G.node[nodename]["ident"].props += "S"  # sparse
 #        #S = G.subgraph(nbunch)
-#        #print S.edges()
+#        #print(S.edges())
 #    return G
 
 
diff --git a/smop/test_lexer.py b/smop/test_lexer.py
index dc9e1cbd..06fa3a42 100644
--- a/smop/test_lexer.py
+++ b/smop/test_lexer.py
@@ -54,8 +54,8 @@ def test040(self):
     def test042(self):
         "backslash-newline continues a line"
         s = "foo \\\n bar ... hello\n bzz"
-        #print 43,`s`
-        #print '#', s.count('\n')
+        #print(43,`s`)
+        #print('#', s.count('\n'))
         self.lexer.input(s)
         # line continuation
         t = [tok.type for tok in self.lexer]
diff --git a/smop/test_matlabarray.py b/smop/test_matlabarray.py
index 6ff20ad8..c5340ffa 100644
--- a/smop/test_matlabarray.py
+++ b/smop/test_matlabarray.py
@@ -31,7 +31,7 @@ def test030(self):
         a[a.shape[0]+1,1:3] = 123
         a[a.shape[0]+1,1:3] = 123
         a[a.shape[0]+1,1:3] = 123
-        #print a.shape
+        #print(a.shape)
         self.assertTrue(isequal (a, [[123,123,123],
                                      [123,123,123],
                                      [123,123,123]]))
@@ -164,7 +164,7 @@ def test100(self):
     def test110(self):
         a = zeros (4,4,dtype=int)
         a[2:3,2:3] = 1
-        #print a
+        #print(a)
         self.assertTrue(isequal (a,[[0,0,0,0],
                                     [0,1,1,0],
                                     [0,1,1,0],
diff --git a/smop/test_primes.py b/smop/test_primes.py
index 323091e0..fc347399 100644
--- a/smop/test_primes.py
+++ b/smop/test_primes.py
@@ -1,3 +1,3 @@
 import liboctave
-print liboctave.primes(10000)
+print(liboctave.primes(10000))