Adapt print statements in examples for Python 3 compatibility

examples/algorithms/rcm.py

@@ -12,21 +12,21 @@
 # build low-bandwidth numpy matrix
 G=nx.grid_2d_graph(3,3)
 rcm = list(reverse_cuthill_mckee_ordering(G))    
-print "ordering",rcm
+print("ordering",rcm)
 
 print("unordered Laplacian matrix")
 A = nx.laplacian_matrix(G)
 x,y = np.nonzero(A)
 #print("lower bandwidth:",(y-x).max())
 #print("upper bandwidth:",(x-y).max())
 print("bandwidth: %d"%((y-x).max()+(x-y).max()+1))
-print A
+print(A)
 
 B = nx.laplacian_matrix(G,nodelist=rcm)
 print("low-bandwidth Laplacian matrix")
 x,y = np.nonzero(B)
 #print("lower bandwidth:",(y-x).max())
 #print("upper bandwidth:",(x-y).max())
 print("bandwidth: %d"%((y-x).max()+(x-y).max()+1))
-print B
+print(B)
 

examples/drawing/giant_component.py

@@ -25,7 +25,7 @@
     from networkx import graphviz_layout
     layout=nx.graphviz_layout
 except ImportError:
-    print "PyGraphviz not found; drawing with spring layout; will be slow."
+    print("PyGraphviz not found; drawing with spring layout; will be slow.")
     layout=nx.spring_layout
 
 

examples/drawing/lanl_routes.py

@@ -21,7 +21,7 @@ def lanl_graph():
     try:
         fh=open('lanl_routes.edgelist','r')
     except IOError:
-        print "lanl.edges not found"
+        print("lanl.edges not found")
         raise
 
     G=nx.Graph()
@@ -52,9 +52,9 @@ def lanl_graph():
 
     G=lanl_graph()
 
-    print "graph has %d nodes with %d edges"\
-          %(nx.number_of_nodes(G),nx.number_of_edges(G))
-    print nx.number_connected_components(G),"connected components"
+    print("graph has %d nodes with %d edges"\
+          %(nx.number_of_nodes(G),nx.number_of_edges(G)))
+    print(nx.number_connected_components(G),"connected components")
 
     import matplotlib.pyplot as plt
     plt.figure(figsize=(8,8))

examples/pygraphviz/write_dotfile.py

@@ -23,15 +23,15 @@
 try:
     m=NX.drawing.write_dot.__module__
 except:
-    print
-    print "pygraphviz or pydot were not found "
-    print "see https://networkx.lanl.gov/Drawing.html for info"
-    print
+    print()
+    print("pygraphviz or pydot were not found ")
+    print("see https://networkx.lanl.gov/Drawing.html for info")
+    print()
     raise
 
-print "using module", m
+print("using module", m)
 
 
 G=NX.grid_2d_graph(5,5)  # 5x5 grid
 NX.write_dot(G,"grid.dot")
-print "Now run: neato -Tps grid.dot >grid.ps"
+print("Now run: neato -Tps grid.dot >grid.ps")