[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Claudiu Popa]

New submission from Claudiu Popa:

Given the following example, Python 3.5 doesn't emit any resource warning:

import io, gc
f = open(a)
bufio = io.BufferedReader(f)
gc.collect()


Here's a small patch that enables this.

--
components: IO
files: buffered_io_resource_warning.patch
keywords: patch
messages: 224040
nosy: Claudiu.Popa
priority: normal
severity: normal
status: open
title: io.BufferedReader hides ResourceWarnings when garbage collected
type: behavior
versions: Python 3.5
Added file: http://bugs.python.org/file36107/buffered_io_resource_warning.patch

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

All works to me.

$ ./python -Wall -c open('/dev/null', 'rb')
-c:1: ResourceWarning: unclosed file _io.BufferedReader name='/dev/null'

--
nosy: +serhiy.storchaka

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Claudiu Popa]

Claudiu Popa added the comment:

That's not the same, try with my example. open(a) will be a TextIOWrapper.

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Claudiu Popa]

Claudiu Popa added the comment:

I mean this one:

$ python_d -Wall -c f=open('a', 'r'); import io; io.BufferedReader(f)

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This example is not correct.

1) Argument of BufferedReader should be binary stream.

 import io, gc
 f = open('/dev/null')
 bufio = io.BufferedReader(f)
 bufio.read(1)
Traceback (most recent call last):
  File stdin, line 1, in module
AttributeError: '_io.TextIOWrapper' object has no attribute 'readinto'

2) gc.collect() doesn't collect file streams because references to them are 
saved in local variables.

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Claudiu Popa]

Claudiu Popa added the comment:

You're right, thanks for the new information. You can close the issue then.

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[issue22078] io.BufferedReader hides ResourceWarnings when garbage collected

[Serhiy Storchaka]

Changes by Serhiy Storchaka storch...@gmail.com:


--
resolution:  - not a bug
stage:  - resolved
status: open - closed

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