@classdef.method("pop")
    @check_frozen()
    def method_pop(self, space, w_num=None):
        if w_num is None:
            if self.items_w:
                return self.items_w.pop()
            else:
                return space.w_nil
        else:
            num = space.int_w(space.convert_type(
                w_num, space.w_fixnum, "to_int"
            ))
            if num < 0:
                raise space.error(space.w_ArgumentError, "negative array size")
            else:
                pop_size = max(0, self.length() * num)
                res_w = self.items_w[pop_size:]
                del self.items_w[pop_size:]
                return space.newarray(res_w)
dataset/ETHPy150Open topazproject/topaz/topaz/objects/arrayobject.py/W_ArrayObject.method_pop/operator `-` -> `*`