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Fri May 1 04:40:14 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-May/089310.html

On Fri, 1 May 2009 06:55:48 am Thomas Breuel wrote:

> You can get the same error on Linux:
>
> $ python
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more
> information.
>
> >>> f=open(chr(255),'w')
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IOError: [Errno 22] invalid mode ('w') or filename: '\xff'

Works for me under Fedora using ext3 as the file system.

$ python2.6
Python 2.6.1 (r261:67515, Dec 24 2008, 00:33:13)
[GCC 4.1.2 20070502 (Red Hat 4.1.2-12)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f=open(chr(255),'w')
>>> f.close()
>>> import os
>>> os.remove(chr(255))
>>>                      

Given that chr(255) is a valid filename on my file system, I would 
consider it a bug if Python couldn't deal with a file with that name.

-- 
Steven D'Aprano

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Non-decodable Bytes in System Character Interfaces