2010/7/18 Alan W. Irwin <ir...@beluga.phys.uvic.ca>:
[...]
> # Get the Python version.
> execute_process(
> COMMAND
> ${PYTHON_EXECUTABLE} -c "import sys; print sys.version.split()[0]"
> OUTPUT_VARIABLE PYTHON_version_output
> OUTPUT_STRIP_TRAILING_WHITESPACE
> )
> SET(PYTHON_VERSION ${PYTHON_version_output} CACHE STRING "Python version")
>
> (We use this approach currently in PLplot.) One caveat is the result of
> the above sometimes has trailing information that needs to be trimmed
> off. For example, on my current system the result is "2.6.5+".
"import sys; print sys.version.split()[0]" will not work with python 3 because
print is a function:
http://docs.python.org/release/3.0.1/whatsnew/3.0.html
so you'd rather use:
"import sys; print(sys.version.split()[0])"
Now you can avoid the trailing informations if you use "sys.version_info"
instead of "sys.version".
On 2.6.5+ you get something like:
>>> print(sys.version_info)
(2, 6, 5, 'final', 0)
while on 3.1.x
>>> print (sys.version_info)
sys.version_info(major=3, minor=1, micro=2, releaselevel='final', serial=0)
using separate
sys.version_info[0]
sys.version_info[1]
sys.version_info[2]
should work both with python 2.[56].x and 3.x.y.
--
Erk
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