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diff --git a/type/__pycache__/enum.cpython-313.pyc b/type/__pycache__/enum.cpython-313.pyc
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diff --git a/type/generic.py b/type/generic.py
new file mode 100644
index 00000000..49daa317
--- /dev/null
+++ b/type/generic.py
@@ -0,0 +1,21 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age:int
+    children: list['Person']
+
+fatma = Person(name="Fatma",age=12, children=[])
+aisha = Person(name="Aisha",age=10, children=[])
+
+imran = Person(name="Imran",age=40, children=[fatma, aisha])
+
+
+def print_family_tree(person: Person) -> None:
+    print(person.name)
+    for child in person.children:
+        print(f"- {child.name} ({child.age})")
+
+print_family_tree(imran)
\ No newline at end of file
diff --git a/type/inheritance b/type/inheritance
new file mode 100644
index 00000000..b5009a51
--- /dev/null
+++ b/type/inheritance
@@ -0,0 +1,97 @@
+from typing import Iterable, Optional
+
+class ImmutableNumberList:
+    def __init__(self, elements: Iterable[int]):
+        self.elements = [element for element in elements]
+
+    def first(self) -> Optional[int]:
+        if not self.elements:
+            return None
+        return self.elements[0]
+
+    def last(self) -> Optional[int]:
+        if not self.elements:
+            return None
+        return self.elements[-1]
+
+    def length(self) -> int:
+        return len(self.elements)
+    
+    def largest(self) -> Optional[int]:
+        if not self.elements:
+            return None
+        largest = self.elements[0]
+        for element in self.elements:
+            if element > largest:
+                largest = element
+        return largest
+
+
+class SortedImmutableNumberList(ImmutableNumberList):
+    def __init__(self, elements: Iterable[int]):
+        super().__init__(sorted(elements))
+
+    def largest(self) -> Optional[int]:
+        return self.last()
+
+    def max_gap_between_values(self) -> Optional[int]:
+        if not self.elements:
+            return None
+        previous_element = None
+        max_gap = -1
+        for element in self.elements:
+            if previous_element is not None:
+                gap = element - previous_element
+                if gap > max_gap:
+                    max_gap = gap
+            previous_element = element
+        return max_gap
+
+
+values = SortedImmutableNumberList([1, 20, 7, 13, 4])
+print(values.largest())
+print(values.max_gap_between_values())
+
+unsorted_values = ImmutableNumberList([1, 19, 7, 13, 4])
+print(unsorted_values.largest())
+# print(unsorted_values.max_gap_between_values()). 'ImmutableNumberList' object has no attribute 'max_gap_between_values'
+
+
+
+class Parent:
+    def __init__(self, first_name: str, last_name: str):
+        self.first_name = first_name
+        self.last_name = last_name
+
+    def get_name(self) -> str:
+        return f"{self.first_name} {self.last_name}"
+
+
+class Child(Parent):
+    def __init__(self, first_name: str, last_name: str):
+        super().__init__(first_name, last_name)
+        self.previous_last_names = []
+
+    def change_last_name(self, last_name) -> None:
+        self.previous_last_names.append(self.last_name)
+        self.last_name = last_name
+
+    def get_full_name(self) -> str:
+        suffix = ""
+        if len(self.previous_last_names) > 0:
+            suffix = f" (née {self.previous_last_names[0]})"
+        return f"{self.first_name} {self.last_name}{suffix}"
+
+person1 = Child("Elizaveta", "Alekseeva")
+print(person1.get_name())
+print(person1.get_full_name())
+person1.change_last_name("Tyurina")
+print(person1.get_name())
+print(person1.get_full_name())
+
+person2 = Parent("Elizaveta", "Alekseeva")
+print(person2.get_name())
+# print(person2.get_full_name()) 'Parent' object has no attribute 'get_full_name'
+# person2.change_last_name("Tyurina") 'Parent' object has no attribute 'change_last_name'
+print(person2.get_name())
+# print(person2.get_full_name()) 'Parent' object has no attribute 'get_full_name'
\ No newline at end of file
diff --git a/type/method.py b/type/method.py
new file mode 100644
index 00000000..d72c8c84
--- /dev/null
+++ b/type/method.py
@@ -0,0 +1,15 @@
+from datetime import date
+thisYear = date.today().year
+
+
+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.age = thisYear - age
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self):
+        return self.age <= thisYear - 18
+
+imran = Person("Imran", 4, "Ubuntu")
+print(imran.is_adult())
diff --git a/type/myDataclasses.py b/type/myDataclasses.py
new file mode 100644
index 00000000..1168df02
--- /dev/null
+++ b/type/myDataclasses.py
@@ -0,0 +1,28 @@
+
+from datetime import date
+from dataclasses import dataclass
+    
+thisYear = date.today().year
+
+
+
+@dataclass
+class Person:
+    name: str
+    DoB: int
+    preferred_operating_system: str
+    
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.DoB = thisYear - age
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self):
+        return self.DoB <= thisYear - 18
+
+imran = Person("Imran", 22, "Ubuntu")  # We can call this constructor - @dataclass generated it for us.
+print(imran)  
+
+imran2 = Person("Imran", 22, "Ubuntu")
+print(imran2)  
+print(imran == imran2)  # Prints True because they have the same DoB
\ No newline at end of file
diff --git a/type/myEnum.py b/type/myEnum.py
new file mode 100644
index 00000000..256d8459
--- /dev/null
+++ b/type/myEnum.py
@@ -0,0 +1,64 @@
+from dataclasses import dataclass
+from enum import Enum
+from typing import List
+
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    ARCH = "Arch Linux"
+    UBUNTU = "Ubuntu"
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: OperatingSystem
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+        if laptop.operating_system == person.preferred_operating_system:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system=OperatingSystem.MACOS),
+]
+
+
+
+namePerson = input("enter your personal name: ")
+try:
+    agePerson = input("enter your age: ")
+except ValueError:
+    print("Invalid age. Age must be a number.")
+    exit()
+try:
+    preferredOS = input("enter your preferred operating system: ")
+except KeyError:
+    print("Invalid operating system entered. Please choose from: MACOS, ARCH, UBUNTU.")
+    exit()
+    
+person=Person(name=namePerson, age=int(agePerson), preferred_operating_system=OperatingSystem[preferredOS])
+possible_laptops = find_possible_laptops(laptops, person)
+print(f"Possible laptops for {person.name}: {possible_laptops}")
+
+
+
diff --git a/type/myType.py b/type/myType.py
new file mode 100644
index 00000000..d0e349de
--- /dev/null
+++ b/type/myType.py
@@ -0,0 +1,40 @@
+def triple(number):
+    return number * 3
+
+print(triple(10))
+
+# Bank account functions
+
+
+def open_account( name:str, amount:float):
+    balances["name"] = int(amount * 100  )
+
+
+
+
+def sum_balances(accounts):
+    total = 0
+    for name, pence in accounts.items():
+        print(f"{name} had balance {pence}")
+        total += pence
+    return total
+
+def format_pence_as_string(total_pence):
+    if total_pence < 100:
+        return f"{total_pence}p"
+    pounds = int(total_pence / 100)
+    pence = total_pence % 100
+    return f"£{pounds}.{pence:02d}"
+
+balances = {
+    "Sima": 700,
+    "Linn": 545,
+    "Georg": 831,
+}
+open_account("Tobi", 9.13)
+open_account("Olya", 7.13)
+
+total_pence = sum_balances(balances)
+total_string = format_pence_as_string(total_pence)
+
+print(f"The bank accounts total {total_string}")
\ No newline at end of file
diff --git a/type/person.py b/type/person.py
new file mode 100644
index 00000000..d803f52e
--- /dev/null
+++ b/type/person.py
@@ -0,0 +1,31 @@
+class Person:
+    def __init__(self, name: str, age: int, address: str, preferred_operating_system: str):
+        self.name = name
+        self.age = age
+        self.address =address
+        self.preferred_operating_system = preferred_operating_system
+
+def is_adult(person: Person) -> bool:
+    return person.age >= 18
+
+# def get_phone(person: Person) -> str:
+#     return person.phone_number
+
+imran = Person("Imran", 22,"Shiraz", "Ubuntu")
+print(imran.name)
+print(imran.address)
+
+aida = Person("Aida", 34, "Tehran", "Arch Linux")
+print(aida.name)
+print(aida.address)
+print(is_adult(imran))
+
+
+
+
+# def get_phone(person: Person) -> str:
+#     return person.phone_number
+#
+# print(get_phone(aida))
+# Person.py:12: error: "Person" has no attribute "phone_number"  [attr-defined]
+# Found 1 error in 1 file (checked 1 source file)
\ No newline at end of file
diff --git a/type/refactor.py b/type/refactor.py
new file mode 100644
index 00000000..502526f6
--- /dev/null
+++ b/type/refactor.py
@@ -0,0 +1,53 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_systems: List[str]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: str
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+
+        for os in person.preferred_operating_systems:
+            if laptop.operating_system.lower() == os.lower():
+                possible_laptops.append(laptop)
+                
+
+    return possible_laptops
+
+
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu", "Arch Linux", "macOS", "Windows"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["Arch Linux", "macOS"]),
+]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system="Arch Linux"),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="Ubuntu"),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="ubuntu"),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system="macOS"),
+]
+
+for person in people:
+    possible_laptops = find_possible_laptops(laptops, person)
+    print("-----")
+    print(f"Laptops possible for {person.name}:")
+    for laptop in possible_laptops:
+        print(f"Possible laptop: {laptop.manufacturer} {laptop.id} {laptop.operating_system}")
+
+