[Python-Dev] Status of the PEP 400? (deprecate codecs.StreamReader/StreamWriter)

[Victor Stinner]

Le 28/07/2011 06:10, Benjamin Peterson a écrit :
>>>> there any reason to continue using codecs.open()?
>>>
>>> It's the easiest way to write Unicode friendly code that spans both 2.x and 3.x.
>>
>> Even on 2.6, where the io module exists?
>
> io on 2.6 is fairly broken and dead slow. The advantage of codecs.open
> is it hasn't changed in the very long time. It still has the same
> reliable buggy behavior no matter what version you're on.
>
> I don't see the problem with leaving codecs.open() to rot a few more
> releases before deprecating it while leaving messaging in the docs
> suggesting io.*.

All these points were already discussed before.

There is a subsection in "Backwards Compatibility" section in the PEP 
400 explaining why codecs.open is NOT deprecated:

http://www.python.org/dev/peps/pep-0400/#keep-the-public-api-codecs-open

"codecs.open() can be replaced by the builtin open() function. open() 
has a similar API but has also more options. Both functions return 
file-like objects (same API).

codecs.open() was the only way to open a text file in Unicode mode until 
Python 2.6. Many Python 2 programs uses this function. Removing 
codecs.open() implies more work to port programs from Python 2 to Python 
3, especially projets using the same code base for the two Python 
versions (without using 2to3 program).

codecs.open() is kept for backward compatibility with Python 2."

Victor