Re: [Mailman-Developers] [Python-Dev] Py2.5 release schedule
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Re: Python 2.5 compatibility
On Jul 28, 2006, at 8:57 AM, Barry Warsaw wrote:
+1. It would give me more type to port and test a few of my
applications to the new version.
I'm still working on Mailman but the most painful thing so far has
been the conversion of exceptions to new-style classes, and even
that wasn't /too/ painful.
I believe I've finished porting Mailman to Python 2.5. None of the
issues were insurmountable, but here they are FTR:
- Exceptions are new-style classes but Mailman was doing one
specific test against the type of an object to see if it needed to be
instantiated. This test was written as:
if isinstance(obj, ClassType)
which fails in Python 2.5. I actually rewrote it like so:
if isinstance(obj, ClassType) or isinstance(obj, type(type))
in MM2.1 because it has to be backward compatible to Python 2.1.
- There was one place where I was commonly raising a string and that
generates deprecation warnings, so I changed that to a class. There
are a few other legacy string exceptions defined in the code, but
they are rarely used and should all get rewritten as well.
- Cookie.py's repr changed so that trailing semicolons are no longer
output on the end of text lines. I understand this change was made
so that Python cookies were more RFC compliant, but it broke some
homegrown cookie text splitting we were doing. I changed this code
to split on lines first.
All in all, not too bad although the Cookie.py change took a while to