Make generate_ast work on py3x

Author: jhgg

scripts/generate_ast.py

@@ -31,22 +31,22 @@ def __init__(self):
         self._fields = []
 
     def start_file(self):
-        print '''# This is autogenerated code. DO NOT change this manually.
+        print('''# This is autogenerated code. DO NOT change this manually.
 # Run scripts/generate_ast.py to generate this file.
 
 
 class Node(object):
-    pass'''
+    pass''')
 
     def end_file(self):
         pass
 
     def start_type(self, name):
         name = remap_type(name)
         parent_type = self._parent_types.get(name, 'Node')
-        print '''
+        print('''
 
-class {name}({parent_type}):'''.format(name=name, parent_type=parent_type)
+class {name}({parent_type}):'''.format(name=name, parent_type=parent_type))
 
     def field(self, type, name, nullable, plural):
         type = remap_type(type)