[PyQt] Python v3 Status
rasky at develer.com
Sat Apr 4 10:27:33 BST 2009
On Sat, 4 Apr 2009 11:17:11 +0200, Detlev Offenbach
<detlev at die-offenbachs.de> wrote:
> that is good news. Do you have any experience how the performance of
> differ between Python v3 and Python v2. Are there any hints about how to
> write a program, that runs with both variants of Python (e.g. writing
> compatibility methods that e.g. turn print() calls into print statements
> v2 or that turn unicode() to str() for v3).
This is the migration path:
* Upgrade to Python 2.6.
* Declare Python 2.5 unsupported (which might or might not be a problem).
* Start using all possibile __future__ imports in your code
(print_function, unicode_literals, etc.), adjusting all your code
* Run your program using "python -3" and fix all the warnings it spouts,
by rephrasing your code.
* At this point, if you run 2to3, you should get perfectly working python
3 code. You can keep editing the Python 2.6 version and machine-generate
the 3.x version until you drop support for 2.x.
* If your generated 3.x code does not fully work, it might be a bug in any
of the following:
* Missing warning in "python -3"
* Missing converter code in 2to3
* Bug in 2to3
In this case, you should report this problem to Python developers with a
testcase, so that they can fix it.
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