File support-python3-pythondemos.patch of Package plplot

Index: plplot-5.15.0/examples/python/pythondemos.py
===================================================================
--- plplot-5.15.0.orig/examples/python/pythondemos.py
+++ plplot-5.15.0/examples/python/pythondemos.py
@@ -53,7 +53,6 @@ for i in range(0,34):
 w.plend()
 
 if len(failed) != 0:
-    import string
-    print "Failed script(s): " + string.join(failed,", ")
+    print("Failed script(s): " + ", ".join(failed))
     sys.exit(1)