Another alternative: if you call your file "test.sage" rather than
"test.py", and then do "sage test.sage" from the command line, it will
be run as if you had typed all the corresponding commands in a Sage
session, so you don't need the "from sage.all import *" line in
Laurent's example above.
David
On May 29, 12:33 pm, Laurent <moky.m...@gmail.com> wrote:
> Sage is a python module.
>
> The following is an example which defines a class from which you can
> manipulate functions :
>
> -------------------------------------------------
>
> #! /usr/bin/sage -python
> # -*- coding: utf8 -*-
>
> from sage.all import *
>
> class MaClasse(object):
> def __init__(self,exp):
> self.sage = exp
> self.sageFast = self.sage._fast_float_(x)
> def Derr(self):
> return MaClasse(self.sage.derivative())
> def Evaluation(self,xe):
> return numerical_approx(self.sageFast(xe))
>
> var('x,y')
> f = MaClasse(x**2+2)
>
> print f.Derr().sage
> print f.Derr().Evaluation(3)
> print f.Evaluation(8)
>
> --------------------------------------
>
> Copy-paste it in a text file, make it executable, and enjoy !
>
> Laurent
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