[issue16297] make csv.DictReader.__init__ use self.fieldnames

[Ramchandra Apte]

Changes by Ramchandra Apte <maniandram01 at gmail.com>:


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title: small fix to csv.DictReader.__init__ -> make csv.DictReader.__init__ use self.fieldnames

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16297>
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