def fun_lin(x, a, b): y = a*x + b print('x_locvar_fun_lin =', x) print('in_globvar_fun_lin =', x_in) return y p0 = 2.5 p1 = 3.0 x_in = 10.0 out = fun_lin(x_in, p0, p1) print('in_globvar_mainprog =', x_in) print('x_locvar_mainprog =', x)