Python 2.5.6和2.4.3

Question

I created a python script with Python 2.5.6 (Windows), tested it and it worked correctly. After I put it on the Server (python 2.4.3, Linux) it compiled, but didn't work. It didn't gave me any traceback or whatsoever. Since it is a trac system it called the Script but then Timed out.

I narrowed the cause down to a few functions, which only appear in the new file:

cursor.fetchall()

or

for x in y
   if(x == 1):
      break #does this work?

or

FILE operations

Is there a common thing I have overseen or does somebody know what it could be?

Due to restrictions I am not able to use python 2.4 as dev. I need to work with Trac Standalone which only works with python 2.5.x.

Answer 1

See What's new in Python 2.5 for the definitive list of features that have been added in Python 2.5. It's pretty extensive. In particular:

New modules include ... the SQLite database module ( sqlite )

Generally, the 2.x series of releases maintain backwards compatibility. However, you seem to be expecting forward compatibility, which is a different thing.

My advice is twofold:

1. Python 2.4 is very old. If you can, get the server upgraded to a more recent version of Python.
2. Regardless of the outcome of the #1, get the dev box onto the same version of Python that you're going to use in production. It would also help if the dev box used the same OS as the prod box (in a virtual machine, if need be).