[issue19829] _pyio.BufferedReader and _pyio.TextIOWrapper destructor don't emit ResourceWarning if the file is not closed

[STINNER Victor]

New submission from STINNER Victor:

$ ./python
Python 3.4.0b1 (default:acabd3f035fe, Nov 28 2013, 15:04:09) 
[GCC 4.8.2 20131017 (Red Hat 4.8.2-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import _pyio
>>> f=_pyio.open("/etc/issue"); f=None
>>> f=_pyio.open("/etc/issue", "rb"); f=None
>>> f=_pyio.open("/etc/issue", "rb", 0); f=None
__main__:1: ResourceWarning: unclosed file <_io.FileIO name='/etc/issue' mode='rb'>
>>> import io
>>> f=io.open("/etc/issue"); f=None
__main__:1: ResourceWarning: unclosed file <_io.TextIOWrapper name='/etc/issue' mode='r' encoding='UTF-8'>
>>> f=io.open("/etc/issue", "rb"); f=None
__main__:1: ResourceWarning: unclosed file <_io.BufferedReader name='/etc/issue'>
>>> f=io.open("/etc/issue", "rb", 0); f=None
__main__:1: ResourceWarning: unclosed file <_io.FileIO name='/etc/issue' mode='rb'>

I expect the same behaviour when I use _pyio or io module.

----------
messages: 204714
nosy: haypo, pitrou
priority: normal
severity: normal
status: open
title: _pyio.BufferedReader and _pyio.TextIOWrapper destructor don't emit ResourceWarning if the file is not closed
versions: Python 3.3, Python 3.4

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19829>
_______________________________________