[Python] read_csv shouldn't close file handles it doesn't own

[asfimport]

If a file-handle is passed into read_csv it is automatically closed:

 

In [47]: csv = io.BytesIO(b'''issue_date_utc,variable_name,station_name,station_id,value_date_utc,value
    ...: 2019-02-26 22:00:00,TEMPERATURE,ARCHERFIELD,040211,2019-02-27 03:00,29.1
    ...: ''')

In [48]: pa.csv.read_csv(csv, convert_options=opts)
Out[48]:
pyarrow.Table
issue_date_utc: timestamp[ns]
variable_name: string
station_name: string
station_id: int64
value_date_utc: string
value: double

In [49]: csv.seek(0)
Traceback (most recent call last):

  File "<ipython-input-50-0644e6e50712>", line 1, in <module>
    csv.seek(0)

ValueError: I/O operation on closed file.

 

This behaviour is in contrast to pandas which leaves the file handle open.

Since the function didn't create the file handle I don't think it should close it.

Reporter: Dave Hirschfeld / @dhirschfeld
Assignee: Wes McKinney / @wesm

PRs and other links:

• GitHub Pull Request #4610

_{Note: This issue was originally created as ARROW-4823. Please see the migration documentation for further details.}

[asfimport]

Dave Hirschfeld / @dhirschfeld:
#3847 (comment)

[asfimport]

Wes McKinney / @wesm:
If you can, please add "[TAG]" to the PR subject titles which helps us see at a glance what kind of issue something is (without looking at the Component JIRA field)

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 4610
#4610