From dcc6ad5861f55199858173f83237fdeb2af46c2e Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 9 Sep 2026 15:56:45 +0100
Subject: [PATCH 1/8] add first exercises

---
 sprint-5/01-predict.py      | 40 +++++++++++++++++++++++++++++++++++++
 sprint-5/02-playcomputer.js | 27 +++++++++++++++++++++++++
 sprint-5/03-fix.py          |  9 +++++++++
 sprint-5/04-addmypy.py      | 39 ++++++++++++++++++++++++++++++++++++
 sprint-5/05-explain.py      | 20 +++++++++++++++++++
 sprint-5/README.md          | 11 ++++++++++
 sprint-5/requirements.txt   |  1 +
 7 files changed, 147 insertions(+)
 create mode 100644 sprint-5/01-predict.py
 create mode 100644 sprint-5/02-playcomputer.js
 create mode 100644 sprint-5/03-fix.py
 create mode 100644 sprint-5/04-addmypy.py
 create mode 100644 sprint-5/05-explain.py
 create mode 100644 sprint-5/README.md
 create mode 100644 sprint-5/requirements.txt

diff --git a/sprint-5/01-predict.py b/sprint-5/01-predict.py
new file mode 100644
index 000000000..fca6e4b1a
--- /dev/null
+++ b/sprint-5/01-predict.py
@@ -0,0 +1,40 @@
+def half(value):
+    return value / 2
+
+def double(value):
+    return value * 2
+
+def second(value):
+    return value[1]
+
+# 1. Predict what you think will happen with each of the following functions
+# 2. Then, test it, and explain in your own words what is actually happening and why
+# (feel free to comment out lines if you think they cause errors or crashes while testing)
+
+print(half(22))
+# Prediction:
+# What actually happens and why:
+
+print(half("22"))
+# Prediction:
+# What actually happens and why:
+
+print(double(22))
+# Prediction:
+# What actually happens and why:
+
+print(double("22"))
+# Prediction:
+# What actually happens and why:
+
+print(second(22))
+# Prediction:
+# What actually happens and why:
+
+print(second(0x16))
+# Prediction:
+# What actually happens and why:
+
+print(second("22"))
+# Prediction:
+# What actually happens and why:
diff --git a/sprint-5/02-playcomputer.js b/sprint-5/02-playcomputer.js
new file mode 100644
index 000000000..2fad07c1c
--- /dev/null
+++ b/sprint-5/02-playcomputer.js
@@ -0,0 +1,27 @@
+import process from "node:process";
+import readline from "node:readline";
+
+const rl = readline.createInterface({
+	input: process.stdin,
+	output: process.stdout,
+});
+
+rl.question("What URL should we fetch?\n> ", async (url) => {
+	const response = await fetch(url);
+	if (!response.ok) {
+		if (response.body.toLowerCase().includes("permission")) {
+			console.error("You didn't have permission to get that URL");
+		} else {
+			console.error(`The request failed - body: ${response.body}`);
+		}
+		process.exit(1);
+	}
+
+	const contents = await response.json();
+
+	console.log(contents);
+
+	rl.close();
+});
+
+// Task: Leave a comment on any line that you can see has some errors explaining what you think the problem is
diff --git a/sprint-5/03-fix.py b/sprint-5/03-fix.py
new file mode 100644
index 000000000..477b11f43
--- /dev/null
+++ b/sprint-5/03-fix.py
@@ -0,0 +1,9 @@
+def double(number):
+    return number * 3
+
+print(double(10))
+
+# Task:
+# What is the bug here?
+# How could you fix it?
+# Are there multiple possible ways to fix it?
diff --git a/sprint-5/04-addmypy.py b/sprint-5/04-addmypy.py
new file mode 100644
index 000000000..e1abe7c45
--- /dev/null
+++ b/sprint-5/04-addmypy.py
@@ -0,0 +1,39 @@
+def open_account(balances, name, amount):
+    balances[name] = amount
+
+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_str(total_pence)
+
+print(f"The bank accounts total {total_string}")
+
+# TASK
+# This code contains bugs related to types. They are bugs mypy can catch.
+#
+# 1. Read this code to understand what it's trying to do.
+# 2. Install and set up mypy in a python virtual environment
+# 3. Add type annotations everywhere appropriate
+# 4. Run `mypy 04-addmypy.py`, and fix any errors
+# 5. When you're confident all of the type annotations are correct, and the bugs are fixed, run the code and check it works.
diff --git a/sprint-5/05-explain.py b/sprint-5/05-explain.py
new file mode 100644
index 000000000..91cff19ad
--- /dev/null
+++ b/sprint-5/05-explain.py
@@ -0,0 +1,20 @@
+imran = {
+  "name": "Imran",
+  "age": 22,
+  "preferred_operating_system": "Ubuntu",
+}
+
+eliza = {
+  "name": "Eliza",
+  "age": 34,
+  "preferred_operating_system": "Arch Linux",
+}
+
+
+print(imran["name"])
+print(imran["address"])
+
+# Task:
+# Try running mypy on this file and see what happens
+# Then try executing the file and see what happens
+# What is happening here?
diff --git a/sprint-5/README.md b/sprint-5/README.md
new file mode 100644
index 000000000..ffd9d59d8
--- /dev/null
+++ b/sprint-5/README.md
@@ -0,0 +1,11 @@
+# Sprint 5
+
+For this task, read through the prep material for sprint 5.
+
+Sprint 5 is all about types in prorgamming.
+
+This directory has some example code and exercises the prep will refer to.
+
+As you read through the prep, complete the tasks here.
+
+Then submit as a PR once you are finished.
diff --git a/sprint-5/requirements.txt b/sprint-5/requirements.txt
new file mode 100644
index 000000000..f0aa93ac8
--- /dev/null
+++ b/sprint-5/requirements.txt
@@ -0,0 +1 @@
+mypy

From 31056a42d1b1514408041ca925cee4e7408b44b8 Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 16 Sep 2026 16:02:30 +0100
Subject: [PATCH 2/8] update classes

---
 sprint-5/{05-explain.py => 05-predict.py} |  4 ++--
 sprint-5/06-classes.py                    | 28 +++++++++++++++++++++++
 2 files changed, 30 insertions(+), 2 deletions(-)
 rename sprint-5/{05-explain.py => 05-predict.py} (73%)
 create mode 100644 sprint-5/06-classes.py

diff --git a/sprint-5/05-explain.py b/sprint-5/05-predict.py
similarity index 73%
rename from sprint-5/05-explain.py
rename to sprint-5/05-predict.py
index 91cff19ad..cc15650d2 100644
--- a/sprint-5/05-explain.py
+++ b/sprint-5/05-predict.py
@@ -16,5 +16,5 @@
 
 # Task:
 # Try running mypy on this file and see what happens
-# Then try executing the file and see what happens
-# What is happening here?
+# Predict what do you think will happen when you run this task?
+# Can you explain what actualy happens?
diff --git a/sprint-5/06-classes.py b/sprint-5/06-classes.py
new file mode 100644
index 000000000..ff335765d
--- /dev/null
+++ b/sprint-5/06-classes.py
@@ -0,0 +1,28 @@
+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.age = age
+        self.preferred_operating_system = preferred_operating_system
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.name)
+print(imran.address)
+
+eliza = Person("Eliza", 34, "Arch Linux")
+print(eliza.name)
+print(eliza.address)
+
+# Task 6.1:
+# Run mypy on this code
+# Fix the code so there are no errors in mypy or when it runs
+
+# Task 6.2:
+# Create a new function in this file called likes_apple
+# It should take a person as parameter
+# It returns true if the preferred operating system is "macOS" or "iOS"
+# It should return false for any other preferred os
+# Add all the appropriate type annotations and test it has no errors in mypy
+
+# Task 6.3:
+# Compare objects and classes
+# What are some advantages and disadvantages of each?

From 5709d46c1bee2ea742830dd32fe5137b1a60616a Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 16 Sep 2026 16:53:46 +0100
Subject: [PATCH 3/8] update methods tasks

---
 sprint-5/07-methods.txt  |  4 ++++
 sprint-5/08-implement.py | 30 ++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 sprint-5/07-methods.txt
 create mode 100644 sprint-5/08-implement.py

diff --git a/sprint-5/07-methods.txt b/sprint-5/07-methods.txt
new file mode 100644
index 000000000..28098862a
--- /dev/null
+++ b/sprint-5/07-methods.txt
@@ -0,0 +1,4 @@
+Answer the following question:
+What is the difference between a method and a function?
+Can you give some advantages of methods over functions?
+
diff --git a/sprint-5/08-implement.py b/sprint-5/08-implement.py
new file mode 100644
index 000000000..3b4f6540f
--- /dev/null
+++ b/sprint-5/08-implement.py
@@ -0,0 +1,30 @@
+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.age = age
+        self.preferred_operating_system = preferred_operating_system
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.is_adult())
+
+# Task:
+# 1. Add the `drivers_license_check` free function and the `is_adult` method into the code
+# 	Make sure your code currently gives the expected output.
+#
+# 2. Change the `Person` class to take a date of birth
+#	Use the standard library's `datetime.date` class
+#	https://docs.python.org/3/library/datetime.html#datetime.date
+#	Store the `date of birth` in a field instead of `age` (it should be a `str`)
+#
+# 3. Try to run your code
+#	How does this change break your code.
+#	What kind of error do you get?
+#	Is it helpful in identifying where your next change needs to be?
+#	Type your thoughts here:
+#
+#
+#
+#
+# 4. Update the `is_adult` method so the error is fixed.
+#	Using the `drivers_license_check` function check everything runs as expected
+

From 4c4928b4b17a949d42cae1518313bef529902edc Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 16 Sep 2026 17:04:54 +0100
Subject: [PATCH 4/8] new dataclass task from poonam

---
 sprint-5/09-dataclass.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 sprint-5/09-dataclass.py

diff --git a/sprint-5/09-dataclass.py b/sprint-5/09-dataclass.py
new file mode 100644
index 000000000..857ef3379
--- /dev/null
+++ b/sprint-5/09-dataclass.py
@@ -0,0 +1,12 @@
+# Task 9.1:
+# Copy the code you have so far from task 08-implement.py
+# Convert this to a dataclass
+# Test that the dataclass works with mypy, with equality checks
+
+# Task 9.2:
+# Add a greeting method that says "Hello, <person name>!"
+
+# Task 9.3:
+# Read the @datatype documentation here: https://docs.python.org/3/library/dataclasses.html
+# Explain what does `frozen=True` do to the class?
+# What other options could you play around with and explore? Offer suggestions for any that would be useful here.

From 259c684c0a6a5706eb1c7bb5309e9a9bee291e2f Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 23 Sep 2026 15:25:12 +0100
Subject: [PATCH 5/8] generic tasks

---
 sprint-5/10-predict.py | 30 ++++++++++++++++++++
 sprint-5/11-fix.py     | 63 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)
 create mode 100644 sprint-5/10-predict.py
 create mode 100644 sprint-5/11-fix.py

diff --git a/sprint-5/10-predict.py b/sprint-5/10-predict.py
new file mode 100644
index 000000000..f4a639b52
--- /dev/null
+++ b/sprint-5/10-predict.py
@@ -0,0 +1,30 @@
+from dataclasses import dataclass
+
+@dataclass(frozen=True)
+class Animal:
+    name: str
+    species: str
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+
+@dataclass(frozen=True)
+class FamilyTree:
+    parent: Person
+    members: list
+
+pet = Animal(name="Gromit", species="Dog")
+fatma = Person(name="Fatma", age=4)
+aisha = Person(name="Aisha", age=6)
+imran = Person(name="Imran", age=30)
+
+family = FamilyTree(parent=imran, members=[fatma, aisha, pet])
+
+def print_family_tree(family: FamilyTree):
+    print(family.parent.name)
+    for child in family.members:
+        print(f"{child.name} ({child.age} years old)")
+
+print_family_tree(family)
diff --git a/sprint-5/11-fix.py b/sprint-5/11-fix.py
new file mode 100644
index 000000000..bbeefe60a
--- /dev/null
+++ b/sprint-5/11-fix.py
@@ -0,0 +1,63 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Animal:
+    name: str
+    size: str
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+
+@dataclass(frozen=True)
+class Tree[T]:
+    parent: T
+    children: List[T]
+
+    def print_tree(self):
+        print(self.parent)
+        for child in self.children:
+            print(child)
+
+fatma = Person(name="Fatma", age=4)
+aisha = Person(name="Aisha", age=6)
+imran = Person(name="Imran", age=30)
+family_tree = Tree[Person](parent=imran, children=[fatma, aisha])
+
+cats = Animal(name="Cat", size="Small")
+dogs = Animal(name="Dog", size="Medium")
+mammals = Animal(name="Mammals", size="Variable")
+species_tree = Tree[Animal](parent=mammals, children=[cats, dogs])
+
+family_tree.print_tree()
+species_tree.print_tree()
+
+# Task 11:
+# Experiment with mypy and make sure that the family tree only takes `Person` types and the species tree only takes `Animal` types.
+#
+# We are going to add printing to the above code.
+#
+# Unlike our earlier example, we want to avoid having to create two
+# separate looping methods to print out an entire tree for each datatype.
+# So we have created a single looping function within Tree that will work for any datatype.
+#
+# Currently the `Tree.print_tree()` function doesn't do anything.
+#
+# Add some appropriate methods to each of the Animal and Person classes to allow it to work.
+#
+# **Stretch task**
+#
+# Think of another type of data that can be organised into a tree.
+#
+# Add a new class for this, instantiate some variables, and have the existing `Tree` class print it out.
+# Here is an example of what should be printed out
+'''
+Imran (30 years old)
+- Fatma (4 years old)
+- Aisha (6 years old))
+Mammals (Variable size)
+- Cat (Small size)
+- Dog (Medium size)
+'''

From 451130c7679c753cebadbc44639e072ce077785e Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 23 Sep 2026 15:42:33 +0100
Subject: [PATCH 6/8] refactoring

---
 sprint-5/12-refactor.py | 57 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 sprint-5/12-refactor.py

diff --git a/sprint-5/12-refactor.py b/sprint-5/12-refactor.py
new file mode 100644
index 000000000..9bf8be375
--- /dev/null
+++ b/sprint-5/12-refactor.py
@@ -0,0 +1,57 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: 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:
+        if laptop.operating_system == person.preferred_operating_system:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_system="Ubuntu"),
+    Person(name="Eliza", age=34, preferred_operating_system="Arch Linux"),
+]
+
+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(f"Possible laptops for {person.name}: {possible_laptops}")
+
+# Task 12
+#Try changing the type annotation of `Person.preferred_operating_system` from `str` to `List[str]`.
+#
+#Run mypy on the code.
+#
+#It tells us different places that our code is now wrong. Fix it to remov eany errors.
+#
+#Now we changed the types, we probably also want to _rename_ our fields to something appropriate.
+#
+#Run mypy again.
+#
+#Fix all of the places that mypy tells you need changing.
+#
+#Then, make sure the program works as you'd expect.

From 880af4c3ffbf49b41759c8ca8db576858410bd31 Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 23 Sep 2026 16:09:30 +0100
Subject: [PATCH 7/8] enums

---
 sprint-5/13-implement.py | 55 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 sprint-5/13-implement.py

diff --git a/sprint-5/13-implement.py b/sprint-5/13-implement.py
new file mode 100644
index 000000000..61bf1fbfc
--- /dev/null
+++ b/sprint-5/13-implement.py
@@ -0,0 +1,55 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: 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:
+        if laptop.operating_system == person.preferred_operating_system:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_system="ubuntu"),
+    Person(name="Eliza", age=34, preferred_operating_system="arch"),
+]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system="arch"),
+    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(f"Possible laptops for {person.name}: {possible_laptops}")
+
+# Task 13
+# It currently handles operating systems as strings.
+#
+# Refactor the code to use enums for operating systems.
+#
+# Check with mypy and test it to ensure the program still works correctly.
+#
+# Replace the list of existing people with the `input` function to read a person's name, age, and preferred operating system.
+#
+# Make sure your implementation has a good user experience, and properly validates the inputs, mapping an OS to one of the enum values.
+#
+# If an operating system can't be matched at all, your script should handle it appropriately and not crash.

From d88743d6e0746c491bce0b568a92918d0c736d7e Mon Sep 17 00:00:00 2001
From: l <l>
Date: Wed, 23 Sep 2026 16:38:32 +0100
Subject: [PATCH 8/8] inheritance

---
 sprint-5/14-analyse.py      | 82 +++++++++++++++++++++++++++++++++++++
 sprint-5/15-playcomputer.py | 42 +++++++++++++++++++
 2 files changed, 124 insertions(+)
 create mode 100644 sprint-5/14-analyse.py
 create mode 100644 sprint-5/15-playcomputer.py

diff --git a/sprint-5/14-analyse.py b/sprint-5/14-analyse.py
new file mode 100644
index 000000000..908db405e
--- /dev/null
+++ b/sprint-5/14-analyse.py
@@ -0,0 +1,82 @@
+from typing import Iterable, Optional
+
+class ImmutableNumberList:
+    # We accept any `Iterable[int]` here, so can construct with a list, a set, or anything else that can be iterated.
+    def __init__(self, elements: Iterable[int]):
+        # We copy the elements so that if someone mutates the passed in elements list, our copy won't be mutated.
+        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]:
+        # To find the largest element, we need to go through the entire list (which may take some time).
+        if not self.elements:
+            return None
+        largest = self.elements[0]
+        for element in self.elements:
+            if element > largest:
+                largest = element
+        return largest
+
+
+# A SortedImmutableNumberList is the same as an ImmutableNumberList,
+# but it changes some aspects.
+class SortedImmutableNumberList(ImmutableNumberList):
+    def __init__(self, elements: Iterable[int]):
+        # We do extra work here when constructing the list,
+        # to make sure the elements are sorted.
+        # This takes more time than the ImmutableNumberList version would.
+        super().__init__(sorted(elements))
+
+    # This method overrides (replaces) the method with the same name on the super-class.
+    def largest(self) -> Optional[int]:
+        # Because we know the elements were already sorted in the constructor,
+        # we can implement finding the largest number faster.
+        # We don't need to look through every element - we know the largest element is at the end.
+        # Because we did extra work one time before (in the constructor),
+        # we can avoid re-doing that work every time someone calls `largest()`.
+        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, 19, 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())  # This doesn't work - the superclass doesn't define this method.
+
+
+# Task 14
+# Try using this code and make sure you understand how it works and what it does
+#
+# Answer the following questions, writing your answers in the file, before checking the answers.
+#
+# Q1: If you know in advance you need to frequently access the largest item of the list, which class will be more efficient and why?
+#
+# Q2: If you know in advance you will be initialising many of them repeatedly, which class will be more efficient and why?
+#
diff --git a/sprint-5/15-playcomputer.py b/sprint-5/15-playcomputer.py
new file mode 100644
index 000000000..0616c8761
--- /dev/null
+++ b/sprint-5/15-playcomputer.py
@@ -0,0 +1,42 @@
+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}"
+
+# Task:
+# Play computer here
+# Describe what is happening and why on each line below here
+# If any lines cause errors, comment out the line and explain why the error happens
+
+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())
+person2.change_last_name("Tyurina")
+print(person2.get_name())
+print(person2.get_full_name())