I half-answer to myself :
> 1. be able to convert a string into a function on which I can use Sage
s = "x**3"
var('x')
f = eval(s)
print f(3)
makes the job
> 2. from the results of Sage (especially from diff(f,x)), I need a
> string that I can manipulate with Python (especially use the .replace
> method in order to produce strings that are valid code for pstricks).
s = "x**3"
var('x')
f = eval(s)
print f(3)
g = diff(f,x)
print g
I would like to get the string "3*(x**2)" or something like that.
Thanks for any ideas
Laurent
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