Stepik 2.1.4 except error

import math

def f_x(x):
   try:
       y = 1 / (x+1) + x / (x-3)
   except:
       print('невозможное значение')
   return y

t = float(input("t = "))

y = f_x(t)

print("f(", t, ") = ", y)