>>> from expressions import items_count_2

>>> items_count_2('((x[i]+2)*(3*r[4]/z)))')
(4, 11)
>>> items_count_2('(f(x)))//(5*x[2]-y)')
(4, 9)
>>> items_count_2('{4:{5:[3, 4], 6:[7, 8]}, 9:[1, 2, 3, 4, 5]}')
(0, 10)
>>> items_count_2("d[4] = {'a':'((x+2)*(3*r/z))}'")
(5, 10)