>>> from expressions import items_count_1

>>> items_count_1('((x[i]+2)*(3*r[4]/z)))')
(4, 3)
>>> items_count_1('(f(x)))//(5*x[2]-y)')
(4, 2)
>>> items_count_1('{4:{5:[3, 4], 6:[7, 8]}, 9:[1, 2, 3, 4, 5]}')
(0, 13)
>>> items_count_1("d[4] = {'a':'((x+2)*(3*r/z))}'")
(5, 3)