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Thanks Hugh,
Are you thinking of something like the following?
class DictWriter:
 def __init__(self, f, fieldnames, restval="", extrasaction="raise",
 dialect="excel", *args, **kwds):
 self._fieldnames = fieldnames # list of keys for the dict
 self._fieldnames_set = set(self._fieldnames)
 @property
 def fieldnames(self):
 return self._fieldnames
 @fieldnames.setter
 def fieldnames(self, value):
 self._fieldnames = value
 self._fieldnames_set = set(self._fieldnames)
 def _dict_to_list(self, rowdict):
 if self.extrasaction == "raise":
 wrong_fields = rowdict.keys() - self._fieldnames_set
 
 ...
If so, I can work on another patch.
Thanks.