james$ cat dict_ex.py
h = { }
print h.iterkeys().next()
james$ ./refactor.py dict_ex.py
Traceback (most recent call last):
  File "./refactor.py", line 475, in <module>
    sys.exit(main())
  File "./refactor.py", line 80, in main
    rt.refactor_args(args)
  File "./refactor.py", line 168, in refactor_args
    self.refactor_file(arg)
  File "./refactor.py", line 222, in refactor_file
    if self.refactor_tree(tree, filename):
  File "./refactor.py", line 262, in refactor_tree
    new = fixer.transform(node)
  File "/Users/james/Documents/py3k/subversion/2to3/fixes/fix_print.py", line 58, in transform
    l_args[0].set_prefix("")
AttributeError: 'DelayedStrNode' object has no attribute 'set_prefix'
james$ cat tup.py
def parse_graminit_c(self, filename):
    try:
        f = open(filename)
    except IOError, err:
        print "Can't open %s: %s" % (filename, err)
        return False
    lineno = 0

    lineno, line = lineno+1, f.next()
james$ ./refactor.py tup.py
Traceback (most recent call last):
  File "./refactor.py", line 475, in <module>
    sys.exit(main())
  File "./refactor.py", line 80, in main
    rt.refactor_args(args)
  File "./refactor.py", line 168, in refactor_args
    self.refactor_file(arg)
  File "./refactor.py", line 222, in refactor_file
    if self.refactor_tree(tree, filename):
  File "./refactor.py", line 262, in refactor_tree
    new = fixer.transform(node)
  File "/Users/james/Documents/py3k/subversion/2to3/fixes/fix_ws_comma.py", line 33, in transform
    prefix = child.get_prefix()
AttributeError: 'DelayedStrNode' object has no attribute 'get_prefix'
james$ cat no_tup.py
def parse_graminit_c(self, filename):
    try:
        f = open(filename)
    except IOError, err:
        print "Can't open %s: %s" % (filename, err)
        return False
    lineno = 0

    # lineno, line = lineno+1, f.next()
james$ ./refactor.py no_tup.py
--- no_tup.py (original)
+++ no_tup.py (refactored)
@@ -1,8 +1,8 @@
 def parse_graminit_c(self, filename):
     try:
         f = open(filename)
-    except IOError, err:
-        print "Can't open %s: %s" % (filename, err)
+    except IOError as err:
+        print("Can't open %s: %s" % (filename, err))
         return False
     lineno = 0
 
RefactoringTool: Files that need to be modified:
RefactoringTool: no_tup.py
james$