Difference in RE between 3.2 and 3.3 (or Aaron Swartz memorial)

Matej Cepl mcepl at redhat.com
Wed Mar 6 14:07:52 CET 2013

On 2013-02-26, 16:25 GMT, Terry Reedy wrote:
> On 2/21/2013 4:22 PM, Matej Cepl wrote:
>> as my method to commemorate Aaron Swartz, I have decided to port his
>> html2text to work fully with the latest python 3.3. After some time
>> dealing with various bugs, I have now in my repo
>> https://github.com/mcepl/html2text (branch python3) working solution
>> which works all the way to python 3.2 (inclusive;
>> https://travis-ci.org/mcepl/html2text). However, the last problem
>> remains. This
>> <li>Run this command:
>> <pre>ls -l *.html</pre></li>
>> <li>?</li>
>> should lead to
>>    * Run this command:
>>          ls -l *.html
>>    * ?
>> but it doesn’t. It leads to this (with python 3.3 only)
>>      * Run this command:
>>            ls -l *.html
>>      * ?
>> Does anybody know about something which changed in modules re or
>> http://docs.python.org/3.3/whatsnew/changelog.html between 3.2 and 
>> 3.3, which could influence this script?
> Search the changelob or 3.3 misc/News for items affecting those two 
> modules. There are at least 4.
> http://docs.python.org/3.3/whatsnew/changelog.html
> It is faintly possible that the switch from narrow/wide builds to 
> unified builds somehow affected that. Have you tested with 2.7/3.2 on 
> both narrow and wide unicode builds?

So, in the end, I have went the long way and bisected cpython to 
find the commit which broke my tests, and it seems that the 
culprit is http://hg.python.org/cpython/rev/123f2dc08b3e so it is 
clearly something Unicode related.

Unfortunately, it really doesn't tell me what exactly is broken 
(is it a known regression) and if there is known workaround.  
Could anybody suggest a way how to find bugs on 
http://bugs.python.org related to some particular commit (plain 
search for 123f2dc0 didn’t find anything).

Any thoughts?


P.S.: Crossposting to python-devel in hope there would be 
somebody understanding more about that particular commit. For 
that I have also intentionally not trim the original messages to 
preserve context.

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