[CMake] Finding Python3

[Alan W. Irwin]

On 2010-07-19 00:47+0200 Eric Noulard wrote:

> "import sys; print sys.version.split()[0]" will not work with python 3 because
> print is a function:

Hi Eric:

Thanks for that reminder about using the print function for python3
and also for giving me the hint about sys.version_info to avoid
trailing information after the version triplet.

To draw this subthread to a definite conclusion, here is what works
for me now to get python version for either python2 or python3.

software at raven> python -c \
'import sys; print("%s.%s.%s" % sys.version_info[0:3])'
2.6.5

software at raven> python3 -c \
'import sys; print("%s.%s.%s" % sys.version_info[0:3])'
3.1.2

So I would recommend this command form to determined the python
version corresponding to the found interpreter for CMake.

Thanks again for your help with this.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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