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comp.lang.python

Re: Python 3.0

Steve Holden

2/18/2008 5:52:00 PM

Blubaugh, David A. wrote:
> Is there a logical reason why Python 3 is not backwards compatible?
>
Yes. For a long time now the next *major* release of Python has been
flagged as one which will take the opportunity to remove several design
flaws from the original language and add features and syntax that
couldn't be added as long as backwards compatibility was maintained.

There are, however, significant features in the 2.6 CPython
implementation that will assist in migration, including an (optional)
warning mode for usages that would cause problems in 3.0 and a tool that
will migrate code that doesn't get flagged with warnings through to
Python 3.0.

So, in summary: 2.6 is the bridge to Python 3.0, and if you use it you
won't have too much trouble migrating when the time comes. Note that
Python 3.0 is currently at alpha2, and that even when it is released the
"preferred" version will be 2.6. The early adopters will beat the snot
out of 3.0, and us ordinary folk will probably not be ready to move
until 3.1 or thereabouts.

regards
Steve
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