The patch in attachment works with Python 2.5 and 2.6 but I can't find a valid
modification which works also for Python 2.3 and 2.4.
Do you have any advice?

Updating code from my previous comment, I like this better: 

try:
    import hashlib.md5 as md5
except ImportError:
    import md5

Tested on my box that works in 2.3, 2.4, 2.5 Python (don't have 2.6 installed 
right now).

Python 2.6 ( r26 :66721, Oct  2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib.md5 as md5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named md5
>>>

Hmm...does it work on Python 2.5 for you? Did they really change the hashlib module
interface *again* in 2.6?

Yeah it works on 2.5 and earlier.
I'm going to ask on python ml.

Nevermind, I see the problem now...we pretty much have to update the code like they
did here: http://code.djangoproject.com/ticket/7919 try:
    import hashlib
    md5_constructor = hashlib.md5
except ImportError:
    import md5
    md5_constructor = md5.new

Then the rest of the code would need to be updated to use the md5 constructor instead
of md5.new() etc. Looks like there's no "nice" way to have hashlib as a drop in
replacement for the old md5 module.

Damn... that's really ugly. Why did they do that?
If md5 module won't be removed from the 2.X trunk we could just filter the warning:

import warnings
warnings.filterwarnings("ignore")
import md5
warnings.filterwarnings("default")

...but that's ugly too.

It's ugly, but we can get away with this (just tested on all versions I have here
locally and it seems to work): 

try:
    import hashlib as md5
    md5.new = md5.md5
except ImportError:
    import md5

Either that, or the previous approach I suggested where we create an "md5" function
aliased to the right module's method on import. I think abstracting it away is a
little cleaner personally, but either should work.

What about this?

try:
    from hashlib import md5
except ImportError:
    from md5 import new as md5

It seems to work on all versions.

That should work too, but that will still require changing the code to use md5()
instead of md5.new() Either way works for me though.

Fixed in r410 .
Thanks guys.

Fixed in version 0.5.1 released on 2009-01-21.