diff --git a/lesson-8/helper.py b/lesson-8/helper.py
new file mode 100644
index 0000000..5e5442e
--- /dev/null
+++ b/lesson-8/helper.py
@@ -0,0 +1,22 @@
+def int_input(prompt):
+    return typed_input(prompt, int)
+
+
+def str_input(prompt):
+    return typed_input(prompt, str)
+
+
+def float_input(prompt):
+    return typed_input(prompt, float)
+
+
+def typed_input(prompt, input_type):
+    value = None
+    while True:
+        try:
+            value = input_type(input(prompt))
+        except ValueError:
+            print('Input error')
+            continue
+        break
+    return value
diff --git a/lesson-8/task-1.py b/lesson-8/task-1.py
new file mode 100644
index 0000000..02ccc5d
--- /dev/null
+++ b/lesson-8/task-1.py
@@ -0,0 +1,42 @@
+import re
+
+
+def get_max_month_days(month):
+    if month == 2:
+        return 28
+    elif month in [4, 6, 9, 11]:
+        return 30
+    return 31
+
+
+class Date:
+    def __init__(self, date_str):
+        if self.validate(date_str):
+            self.date = date_str
+        else:
+            raise ValueError
+
+    def __str__(self):
+        return self.date
+
+    @classmethod
+    def parse(cls, date_str):
+        # return map(int, date_str.split('-'))
+        date_split = date_str.split('-')
+        return int(date_split[0]), int(date_split[1]), int(date_split[2])
+
+    @staticmethod
+    def validate(date_str):
+        if not re.match(r'\d{1,2}-\d{1,2}-\d{4}', date_str):
+            return False
+        day, month, year = Date.parse(date_str)
+        has_errors = month not in range(1, 12)
+        has_errors |= day not in range(1, get_max_month_days(month))
+        return not has_errors
+
+
+try:
+    print(Date.parse('46-4-2341'))
+    print(Date.validate('46-4-2341'))
+except ValueError:
+    print('Date error')
diff --git a/lesson-8/task-2.py b/lesson-8/task-2.py
new file mode 100644
index 0000000..bf2b788
--- /dev/null
+++ b/lesson-8/task-2.py
@@ -0,0 +1,24 @@
+from helper import int_input
+
+
+class MyZeroDivisionExtension(Exception):
+    pass
+
+
+class Number:
+    def __init__(self, num: int):
+        self.num = num
+
+    def __truediv__(self, other):
+        if other.num == 0:
+            raise MyZeroDivisionExtension('Division by zero')
+        return self.num/other.num
+
+
+number1 = Number(int_input('Enter number 1: '))
+number2 = Number(int_input('Enter number 2: '))
+
+try:
+    print('Div: ', number1 / number2)
+except MyZeroDivisionExtension as e:
+    print(e.__class__.__name__, ':', e)
diff --git a/lesson-8/task-3.py b/lesson-8/task-3.py
new file mode 100644
index 0000000..f43921c
--- /dev/null
+++ b/lesson-8/task-3.py
@@ -0,0 +1,37 @@
+import re
+
+
+class InvalidListValueException(Exception):
+    pass
+
+
+class IntList:
+    def __init__(self):
+        self._elements = []
+
+    @staticmethod
+    def validate(value):
+        return re.match(r'\d+', value)
+
+    def append(self, value):
+        if not self.validate(value):
+            raise InvalidListValueException('Input value must be number')
+        self._elements.append(int(value))
+
+    def __str__(self):
+        return ' '.join(map(str, self._elements))
+
+
+int_list = IntList()
+while True:
+    input_string = input('Enter number or stop: ')
+    if input_string.lower() == 'stop':
+        break
+
+    try:
+        int_list.append(input_string)
+    except InvalidListValueException as e:
+        print(e.__class__.__name__, ':', e)
+
+print('Result:')
+print(int_list)
diff --git a/lesson-8/task-4_6.py b/lesson-8/task-4_6.py
new file mode 100644
index 0000000..a1a8944
--- /dev/null
+++ b/lesson-8/task-4_6.py
@@ -0,0 +1,54 @@
+import datetime
+import random
+import string
+
+from warehouse import models
+
+BRANDS_LIST = ['Canon', 'LG', 'Philips', 'Xiaomi']
+
+
+def generate_model_name():
+    return '%s (%s)' % (
+        random.choice(BRANDS_LIST),
+        random.choices(string.ascii_uppercase + string.digits, k=8)
+    )
+
+
+def generate_equip():
+    cls = random.choice(models.Equipment.__subclasses__())
+    return cls(
+        model=generate_model_name(),
+        year=random.randint(2000, datetime.date.today().year),
+        is_new=random.choice([True, False, True])
+    )
+
+
+equipments = [generate_equip() for i in range(10)]
+
+eq_1 = equipments[0]
+eq_2 = equipments[1]
+
+deparment_1 = models.Department('Department 1')
+deparment_2 = models.Department('Department 2')
+warehouse = models.Warehouse('Main')
+
+warehouse.append_list(equipments)
+print('==== WAREHOUSE BALANCE ====')
+warehouse.balance()
+print('==================')
+warehouse.append(eq_1)
+
+warehouse.move_equipment(eq_1, deparment_1)
+warehouse.move_equipment(eq_2, deparment_1)
+warehouse.move_equipment(eq_1, deparment_2)
+print('========= DEPARTMENT 1 BALANCE =========')
+deparment_1.balance()
+print('==================')
+
+try:
+    warehouse.move_equipments(models.Printer.__name__, deparment_2, 2)
+except AssertionError as e:
+    print('На складе нет столько техники')
+print('========= DEPARTMENT 2 BALANCE =========')
+deparment_2.balance()
+print('==================')
diff --git a/lesson-8/task-7.py b/lesson-8/task-7.py
new file mode 100644
index 0000000..283dc33
--- /dev/null
+++ b/lesson-8/task-7.py
@@ -0,0 +1,56 @@
+import unittest
+
+
+class Complex:
+    def __init__(self, real, imagine):
+        assert isinstance(real, int)
+        assert isinstance(imagine, int)
+        self.real = real
+        self.imagine = imagine
+
+    def __add__(self, other):
+        return Complex(self.real + other.real, self.imagine + other.imagine)
+
+    def __mul__(self, other):
+        return Complex(
+            real=(self.real * other.real - self.imagine * other.imagine),
+            imagine=(self.real * other.imagine + self.imagine * other.real)
+        )
+
+    def __str__(self):
+        if self.imagine == 0:
+            return str(self.real)
+
+        return '(%s%s%sj)' % (
+            self.real,
+            '+' if self.imagine > 0 else '-',
+            abs(self.imagine) if self.imagine != 1 else ''
+        )
+
+
+class ComplexTest(unittest.TestCase):
+    def test_str(self):
+        complex_1 = Complex(1, 2)
+        complex_2 = complex(1, 2)
+        self.assertEqual(str(complex_1), str(complex_2))
+
+    def test_add(self):
+        c_1_1 = Complex(1, 2)
+        c_1_2 = Complex(2, 1)
+
+        c_2_1 = complex(1, 2)
+        c_2_2 = complex(2, 1)
+
+        self.assertEqual(str(c_1_1 + c_1_2), str(c_2_1 + c_2_2))
+
+    def test_mul(self):
+        c_1_1 = Complex(3, 1)
+        c_1_2 = Complex(8, 4)
+
+        c_2_1 = complex(3, 1)
+        c_2_2 = complex(8, 4)
+
+        self.assertEqual(str(c_1_1 * c_1_2), str(c_2_1 * c_2_2))
+
+
+unittest.main()
diff --git a/lesson-8/warehouse/__init__.py b/lesson-8/warehouse/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/lesson-8/warehouse/models.py b/lesson-8/warehouse/models.py
new file mode 100644
index 0000000..89f624b
--- /dev/null
+++ b/lesson-8/warehouse/models.py
@@ -0,0 +1,143 @@
+import random
+
+
+class Department:
+    def __init__(self, name: str):
+        assert len(name) > 0
+        self.name = name
+        self._storage = []
+        self._counts = {cls.__name__: 0 for cls in Equipment.__subclasses__()}
+
+    def append(self, equipment):
+        assert issubclass(equipment.__class__, Equipment)
+        if not self.find_in_storage(equipment):
+            self._storage.append(equipment)
+            self._counts[equipment.__class__.__name__] += 1
+        else:
+            print('Техника уже на складе')
+
+    def append_list(self, equipments):
+        for equipment in equipments:
+            self.append(equipment)
+
+    def remove(self, equipment):
+        assert issubclass(equipment.__class__, Equipment)
+        if self.find_in_storage(equipment):
+            self._storage.remove(equipment)
+            self._counts[equipment.__class__.__name__] -= 1
+            return True
+        return False
+
+    def find_in_storage(self, equipment):
+        assert issubclass(equipment.__class__, Equipment)
+        return next((x for x in self._storage if x == equipment), None)
+
+    def get_all(self, equipment_type):
+        # return [x for x in self._storage if x.__class__ == equipment_type]
+        for x in self._storage:
+            if x.__class__.__name__ == equipment_type:
+                yield x
+
+    def balance(self):
+        for cls, cnt in self._counts.items():
+            print(f'{cls}: {cnt}')
+
+
+class Warehouse(Department):
+
+    def move_equipment(self, equipment, department):
+        if self.remove(equipment):
+            department.append(equipment)
+        else:
+            print('На складе нет необходимой техники')
+
+    def back_equipment(self, equipment, department):
+        if department.remove(equipment):
+            self.append(equipment)
+        else:
+            print('В отделении нет необходимой техники')
+
+    def move_equipments(self, equipment_type, deparmet, count):
+        assert self._counts[equipment_type] >= count
+        for equipment in self.get_all(equipment_type):
+            self.move_equipment(equipment, deparmet)
+
+
+class Equipment:
+    def __init__(self, model: str, year: int, is_new: bool):
+        self.serial = random.randint(10000, 999999)  # серийный номер
+        self.model = model  # модель
+        self.year = year  # год выпуска
+        self.is_new = is_new  # новый/бу
+        self.is_broken = False
+
+    def __str__(self):
+        return f'{self.serial} {self.model} {self.year}'
+
+    def broke(self):
+        print('Упс! Устройство сломалось')
+        self.is_broken = True
+
+    def repair(self):
+        self.is_broken = False
+        self.is_new = False
+
+    def action(self):  # действие устройства
+        if random.randint(0, 100) < 10:
+            self.broke()
+        return True
+
+    def __eq__(self, other):
+        return isinstance(other, self.__class__) and other.serial == self.serial
+
+
+class Printer(Equipment):
+    def __init__(self, model, year, is_new):
+        super().__init__(model, year, is_new)
+        self._ink = {'r': 0, 'g': 0, 'b': 0}  # черлила
+
+    def refuel(self):
+        self._ink = {'r': 100, 'g': 100, 'b': 100}
+
+    def action(self):
+        if not self.can_print():
+            self._empty_ink_signal()
+            return False
+        # при печати принтер тратит бумагу
+        for k, ink in self._ink.items():
+            self._ink[k] = random.randint(0, ink - 10) if ink - 10 > 0 else 0
+        return super().action()
+
+    def can_print(self):
+        ret = True
+        for ink in self._ink:
+            ret &= ink > 0
+        return ret
+
+    def _empty_ink_signal(self):
+        print('Кончились чернила, необходимо замена')
+
+
+class Fax(Equipment):
+    def __init__(self, model, year, is_new):
+        super().__init__(model, year, is_new)
+        self._papers = 100
+
+    def action(self):
+        if self._papers == 0:
+            print('Закончилась бумага')
+            return False
+        self._papers -= random.randint(1, self._papers)
+        return super().action()
+
+
+class Scaner(Equipment):
+    def action(self):
+        print('Сканирование...')
+        return super().action()
+
+
+class Xerox(Equipment):
+    def action(self):
+        print('Ксерокопирование...')
+        return super().action()