Make avro.io.DataFileReader iterable
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                 Key: AVRO-155
                 URL: https://issues.apache.org/jira/browse/AVRO-155
             Project: Avro
          Issue Type: Improvement
          Components: python
            Reporter: Jeff Hammerbacher


When reading records out of a file object container using the Python bindings, 
it would be great to be able to say:

{code}
for record in dfr:
  <do something with record>
{code}

There's already a "next()" method defined on the DataFileReader, but the 
__iter__ method is not defined and we "return None" instead of "raise 
StopIteration" when out of records.


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