sympy and sage

edit

Playing with Sage and Sympy I accidentally ran sage from the directory ~/.config/ipython/profile_sympy and noticed that the "engine" of symbolic computation has changed:

  type (1)
  sympy.core.numbers.One

The same thing happens if from sage to execute:

  from sympy import *

Is it experimental feature? Will it grow? What are plans to integrate sympy and sage if they are? What about some quirks (in sympy, for example, I can't define something like f(x) = x+1)

Thank you and sorry for my English.