Roger Serwy <roger.se...@gmail.com> added the comment:

I agree that chr(32) should be included in FILENAME_CHARS. 

The algorithm for backward searching checks that each character is contained in 
FILENAME_CHARS. I'm concerned about running time, as expanding FILENAME_CHARS 
to include all valid Unicode would be a large set to search. Do you know a 
better algorithm for determining when to perform a file-system completion when 
in a string?

Also, are there any Unicode code points above 127 that are not valid in a 
filename? I appreciate that different file systems can have different 
constraints but I don't know all these subtle points.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14937>
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