Alec Posney created ARROW-2090:

             Summary: Add context manager methods to ParquetWriter
                 Key: ARROW-2090
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Alec Posney

Add the ability to use python {{with}} syntax on the {{ParquetWriter}} object.

For example:
with pq.ParquetWriter(foo, schema) as writer:

The benefit of this syntax is that it removes the chances of you writing out a 
partial (invalid) parquet file, which is currently possible if you forget to 
call the close method, or more likely the close method is not called due to an 
exception being thrown. 

It should still be possible to use the previous syntax for backwards 
compatibility and fine grained control reasons.
Similarly, the {{parquet}} module level {{write_table}} method should be able 
to use the new syntax without changing previous behaviour. 

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