switch to python 3

Author: bmcutler

examples/04_python_static_analysis/config/config.json

@@ -13,10 +13,10 @@
       // Here, multiple commands are provided (to be executed in sequence).
       // The first is to execute the student code, the second is to count the number of calls to the
       // "print" function.
-      "command" : [ "python *.py",
-	            "submitty_count token -l python Equal *.py",
-		    "submitty_count token -l python Asterisk *.py",
-		    "submitty_count token -l python Plus *.py" ],
+      "command" : [ "python3 *.py",
+	            "submitty_count token -l python3 Equal *.py",
+		    "submitty_count token -l python3 Asterisk *.py",
+		    "submitty_count token -l python3 Plus *.py" ],
       "points" : 4,
       "validation" : [
         // First, ensure that the student received the correct answer.