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It says
> csv.reader(csvfile[, dialect='excel'][, fmtparam])
> csv.writer(csvfile[, dialect='excel'][, fmtparam])
in 2.7. I presume it should be like in 3.x:
> csv.reader(csvfile, dialect='excel', **fmtparams)
> csv.writer(csvfile, dialect='excel', **fmtparams)
Or am I missing something?
(I found argument renaming to be too invasive for my default-args-notation ticket #14804)

I verified from the source that it should be **fmtparams also in 2.7. Make sure you change the description texts, too, to s/fmtparam/fmtparams/.

Chris: Thanks for the patch. I'm not sure register_dialect()'s signature is good like that, though. Hynek, what do you think?

What does bother you? Both sigs look like in py3 if I'm looking correctly.

Well, I wasn't sure about [optional] params before **kwargs. But if that's ok, then I think the patch is good.

It seems correct like that:
static PyObject *
csv_register_dialect(PyObject *module, PyObject *args, PyObject *kwargs)
{
 PyObject *name_obj, *dialect_obj = NULL;
 PyObject *dialect;
 if (!PyArg_UnpackTuple(args, "", 1, 2, &name_obj, &dialect_obj))
 return NULL;
Therefore going to commit.

New changeset dc080e19f7aa by Hynek Schlawack in branch '2.7':
#14880: Fix kwargs notation in csv.reader, .writer & .register_dialect
http://hg.python.org/cpython/rev/dc080e19f7aa 

Thank you for your contribution Chris!