import numba as nb
op = '+'
def f(a, b):
if op=='+': return a+b
if op=='*': return a*b
def F(operaton):
global op;
op = operaton
_ = nb.njit(f)
_(0, 0)
return _
add = F('+')
mul = F('*')
print('2+3', add(2,3))
print('2*3', mul(2,3))