Python 2.6 and deprecated modules

[Matt Knepley]

I like 1) as well. However someone needs to test the fixes on ancient  
RH python.

   Matt

 From the phone

On Jul 13, 2009, at 1:15 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:

> Fedora 11 moved to Python 2.6. Now many Python stdlib modules are
> deprecated (as part of the transition to Python 3.x series).
>
> /u/dalcinl/Devel/PETSc/petsc-dev/config/BuildSystem/config/ 
> compilers.py:7:
> DeprecationWarning: the sets module is deprecated
>  import sets
> /u/dalcinl/Devel/PETSc/petsc-dev/config/PETSc/package.py:7:
> DeprecationWarning: the md5 module is deprecated; use hashlib instead
>  import md5
> /u/dalcinl/Devel/PETSc/petsc-dev/config/BuildSystem/script.py:101:
> DeprecationWarning: The popen2 module is deprecated.  Use the
> subprocess module.
>  import popen2
>
> We could take two approaches to remove these warnings (I bet all you
> hate warnings as much as me):
>
> 1) Reimplement things using the modern API's, perhaps by using
> conditional code depending on the Python version and/or using import
> with try/except blocks. In particular, this will require:
> a) use the builtin 'set' type (available since Python 2.4)
> b) use the 'hashlib' module (available since Python 2.5)
> c) moving from using 'peopen2' to 'subprocess' (BTW, available since
> Python2.4) will likely remove the need to use 'select', which I
> commented some time ago it is not supported (for pipes) in native
> Windows Python (yes, some day I'll have some working code with the
> native Windows Python).
>
> 2) Silent these warnings. I do not think these modules will be ever
> removed from 2.x series, and porting the whole BuildSystem beast to
> Python 3.0 is not going to be a 10-minutes task anyway.
>
>
> I personally prefer (1) and volunteer to provide the fixes, even if
> that is more work than (2). I would like to know your opinions before
> start to work on this.
>
>
> -- 
> Lisandro Dalcín
> ---------------
> Centro Internacional de Métodos Computacionales en Ingeniería (CIME 
> C)
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> C)
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