On 29/10/2011 9:52 AM, Victor Stinner wrote:
Hi,
I am not more conviced that raising a UnicodeEncodeError on unencodable
characters is the right fix for the issue #13247. The problem with this
solution is that you have to wait until an user get a UnicodeEncodeError.
I have yet another proposition: emit a warning when a bytes filename is used.
So it doesn't affect the default behaviour, but you can use -Werror to test if
your program is fully Unicode compliant on Windows (without having to test
invalid filenames).
I don't know if a BytesWarning or a DeprecationWarning is more apropriate. It
depends if we plan to drop support of bytes filenames on Windows later (in
Python 3.5 or later).
When previously discussing this issue, I was under the impression that
the problem was unencodable bytes passed from the Python code to Windows
- but the reverse is true - only the data coming back from Windows isn't
encodable.
This changes my opinion significantly :) I don't think raising an error
is the right choice - there are almost certainly use-cases where the
current behaviour works OK and we would break them (eg, not all files in
a directory are likely to be unencodable). As the data came externally,
the only solution the programmer has is to change to the unicode version
of the api - so we recommend the bytes version not be used by anyone,
anytime - which means it is conceptually deprecated already.
Therefore, as you imply, I think the solution to this issue is to start
the process of deprecating the bytes version of the api in py3k with a
view to removing it completely - possibly with a less aggressive
timeline than normal. In Python 2.7, I think documenting the issue and
a recommendation to always use unicode is sufficient (ie, we can't
deprecate it and a new BytesWarning seems gratuitous.)
Cheers,
Mark
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