I really like your point about how Python should give a better error than a SyntaxError when a Python 2 script is run on a Python 3 interpreter. I agree that the cause of problems should be pointed out clearly to end users. However, I disagree that adding a new file extension is necessary.
On Mon, Feb 04, 2008 at 03:34:56PM -0800, Ralf W. Grosse-Kunstleve wrote:
>
> If the success of Python is to continue, you have to give your large
> user base a clear path to working with two co-existing Python
> versions, so that installing a Python 3 application doesn't break all
> Python 2 applications (some of which may never be converted since the
> original developers have moved on). For example, I really need to be
> able to use wxPython based on Python 2 and wxPython based on Python 3
> simultaneously on my Windows machine. I'm thinking this is only
> possible if Python 3 uses a new file extension.
In Python 2, "import wxPython" will import wxPython based on Python 2,
and on Python 3, it will import wxPython based on Python 3. There
wouldn't be a Python 2 version of wxPython in the python3.0
site-packages.
> Ideally, I'd even want to have both Python 2 and Python 3 scripts in
> the same directory, while incrementally converting our applications.
> I'd want to cp script.py script.py3, then edit the .py3 version until
> it works, while still being able to run the old version during the
> migration period.
I kind of like the idea of doing the following:
import sys
major_version = sys.version_info[0]
if major_version == 2:
import script2
script2.main()
elif major_version == 3:
import script3
script3.main()
It really shouldn't be too bad, I think.
--
Andrew McNabb
http://www.mcnabbs.org/andrew/
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