Mailing List Archive: [issue5107] built-in open(..., encoding=vague

[issue5107] built-in open(..., encoding=vague_default)

Jan 29, 2009, 9:00 PM

Post #1 of 4 (396 views)

New submission from John Machin <sjmachin@users.sourceforge.net>:

Docs say """The default encoding is platform dependent""" but don't say
how to find out what that is, or how it is determined. On my Windows XP
SP3 setup, the default is cp1252, but the best/only guess at finding out
without actually opening a file involved sys.defaultencoding() which
produces 'utf-8'. I was pointed at locale.getpreferredencoding(), which
returns 'cp1252' on my machine.

Please add a sentence along these lines: The default encoding is
(obtained by calling|the same as) locale.getpreferredencoding(), not
sys.getdefaultencoding() -- corrected/amplified as necessary.

----------
assignee: georg.brandl
components: Documentation
messages: 80811
nosy: georg.brandl, sjmachin
severity: normal
status: open
title: built-in open(..., encoding=vague_default)
versions: Python 3.0, Python 3.1

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[issue5107] built-in open(..., encoding=vague_default) [ In reply to ]

report at bugs

Jan 30, 2009, 7:00 AM

Post #2 of 4 (363 views)

Permalink

Antoine Pitrou <pitrou@free.fr> added the comment:

It is more complicated than that. The algorithm is currently as follows
(copied from TextIOWrapper.__init__):

if encoding is None:
try:
encoding = os.device_encoding(buffer.fileno())
except (AttributeError, UnsupportedOperation):
pass
if encoding is None:
try:
import locale
except ImportError:
# Importing locale may fail if Python is being built
encoding = "ascii"
else:
encoding = locale.getpreferredencoding()

----------
nosy: +pitrou

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[issue5107] built-in open(..., encoding=vague_default) [ In reply to ]

report at bugs

Jan 30, 2009, 12:54 PM

Post #3 of 4 (363 views)

Permalink

Changes by Giampaolo Rodola' <billiejoex@users.sourceforge.net>:

----------
nosy: +giampaolo.rodola

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[issue5107] built-in open(..., encoding=vague_default) [ In reply to ]

report at bugs

Feb 5, 2009, 2:47 AM

Post #4 of 4 (349 views)

Permalink

Georg Brandl <georg@python.org> added the comment:

The device_encoding(buffer.fileno()) doesn't matter for open(), so I've
documented that getpreferredencoding() is used in r69291.

----------
resolution: -> fixed
status: open -> closed

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<http://bugs.python.org/issue5107>
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