class CPU:

    def __init__(self, name, freq):
        self.name = name
        self.fr = freq

class Memory:

    def __init__(self, name, size):
        self.name = name
        self.volume = size

class MotherBoard:

    def __init__(self, name, cpu, memory):
        self.name = name
        self.cpu = cpu
        self.total_mem_slots = 4
        self.mem_slots = memory[:4]

    def get_config(self):
        arr = []
        arr.append('Материнская плата: '+ self.name)
        arr.append('Центральный процессор: '+ self.cpu.name + ' ,' + str(self.cpu.fr))
        arr.append('Слотов памяти: ' + str(self.total_mem_slots))
        temp_arr = []
        for i in range(len(self.mem_slots)):
            temp_arr.append(self.mem_slots[i].name + ' - ' + str(self.mem_slots[i].volume) + ';')

        arr.append('Память: ' + ''.join(temp_arr))
        arr[3] = arr[3][:-1] # последняя ; не нужна
        return(arr)

cpu = CPU('asus', 1333)
mem1, mem2 = Memory('Kingstone', 4000), Memory('Kingstone', 4000)
mb = MotherBoard('Asus', cpu, [mem1, mem2])
print(mb.get_config())