Use Python3's print function.

pecan/commands/base.py

@@ -142,7 +142,8 @@ class BaseCommandParent(object):
 
             def run(self, args):
                 super(SomeCommand, self).run(args)
-                print(args.extra_arg)
+                if args.extra_arg:
+                    pass
     """
 
     arguments = ({

pecan/commands/serve.py

@@ -1,11 +1,14 @@
 """
 Serve command for Pecan.
 """
+from __future__ import print_function
 import os
 import sys
 import time
 import subprocess
 
+import six
+
 from pecan.commands import BaseCommand