diff --git a/csp.py b/csp.py
index 1ec2f63b8..3d36a6d0f 100644
--- a/csp.py
+++ b/csp.py
@@ -73,7 +73,7 @@ def conflict(var2):
     def display(self, assignment):
         "Show a human-readable representation of the CSP."
         # Subclasses can print in a prettier way, or display with a GUI
-        print 'CSP:', self, 'with assignment:', assignment
+        print ('CSP:', self, 'with assignment:', assignment)
 
     ## These methods are for the tree- and graph-search interface:
 
@@ -460,13 +460,13 @@ def display(self, assignment):
                 if assignment.get(var,'') == val: ch = 'Q'
                 elif (var+val) % 2 == 0: ch = '.'
                 else: ch = '-'
-                print ch,
-            print '    ',
+                print (ch),
+            print ('    ',)
             for var in range(n):
                 if assignment.get(var,'') == val: ch = '*'
                 else: ch = ' '
-                print str(self.nconflicts(var, val, assignment))+ch,
-            print
+                print ((str(self.nconflicts(var, val, assignment))+ch),)
+            print ()
 
 #______________________________________________________________________________
 # Sudoku
@@ -541,8 +541,8 @@ def display(self, assignment):
         def show_box(box): return [' '.join(map(show_cell, row)) for row in box]
         def show_cell(cell): return str(assignment.get(cell, '.'))
         def abut(lines1, lines2): return map(' | '.join, zip(lines1, lines2))
-        print '\n------+-------+------\n'.join(
-            '\n'.join(reduce(abut, map(show_box, brow))) for brow in self.bgrid)
+        print ('\n------+-------+------\n'.join(
+            '\n'.join(reduce(abut, map(show_box, brow))) for brow in self.bgrid))
 
 #______________________________________________________________________________
 # The Zebra Puzzle
@@ -599,10 +599,10 @@ def solve_zebra(algorithm=min_conflicts, **args):
     z = Zebra()
     ans = algorithm(z, **args)
     for h in range(1, 6):
-        print 'House', h,
+        print ('House', h,)
         for (var, val) in ans.items():
-            if val == h: print var,
-        print
+            if val == h: print (var,)
+        print ()
     return ans['Zebra'], ans['Water'], z.nassigns, ans