As a partial answer to the original question, in Sage one can do
sage: is_package_installed('python')
True
On Mar 30, 2010, at 10:02 AM, William Stein wrote:
On Tue, Mar 30, 2010 at 8:04 AM, Simon King
<simon.k...@nuigalway.ie> wrote:
Hi Dave,
On Mar 30, 2:50 pm, David Kirkby <david.kir...@onetel.net> wrote:
...
I can see there might be even more Solaris issues!
Since python 3 is not backward compatible with python 2, there could
be even more problems in future.
Probably one could write a simple Python script that is both
executable in Python 2 and Python 3.
However, I share your general concerns.
For any build system stuff, I think it is trivial to write scripts
that work in python 2.3, 2.4, 2.5, 2.6, 3.x, etc.
Just don't use decorators, class properties, and use print as a
function call.
In particular, it's much, much easier than writing (let alone
maintaining) cross platform shell scripts.
Personally I would have stuck to POSIX scripts until python in
Sage was built.
Yes.
No.
Is it true that Python is the first thing that is built when
installing Sage?
No, certainly not.
If it is, then IMO there is no problem at all in using Python
scripts.
The spkg-install of the python spkg must not rely on Python, but
everything else can use Python.
Python isn't built first.
Just as an interesting aside, Python compiles the minimal amount it
needs to run from C, then uses Python to orchestrate the rest of its
own build process.
However, there is still no problem using python in the build system.
As was pointed out above, we already do. I would like to encourage
more use of Python.
+1. I would guess the fact that the build system is written in a
(relative to Python) brittle and arcane language is one of the reasons
so few people dare touch or fix it.
- Robert
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