On Thu, Dec 28, 2017 at 8:38 PM, Nico Vogeli <nicco.9537 at gmail.com> wrote: > Withs test, this return a correct value for the two x functions: >> from sympy import symbols >> x = symbols('x') > f1 = eval(input('function 1 ')) > f2 = eval(input('function 2 ')) > What are you typing as input? It's hard to grok your code without knowing that. ChrisA