London | Elhadj Abdoul Diallo | Module-Decomposition | WEEK4 - prep-exercises

.gitignore

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+.venv.
+node_modules

classes_and_objects.py

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+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
+
+    def is_adult(self) -> bool:
+            return self.age >= 18
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.name)
+# print(imran.address) # address is not an attribute of the Person class
+print(imran.is_adult())
+
+eliza = Person("Eliza", 34, "Arch Linux")
+print(eliza.name)
+# print(eliza.address)# address is not an attribute of the Person class
+
+def get_address(person: Person) -> str:
+     return person.address
+
+print(get_address(imran))

data_classes.py

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+from dataclasses import dataclass
+from datetime import date
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    date_of_birth: date
+    preferred_operating_system: str
+
+    def is_adult(self) -> bool:
+        current_date = date.today()
+        age = current_date.year - self.date_of_birth.year - (
+            (current_date.month, current_date.day) < (self.date_of_birth.month, self.date_of_birth.day)
+        )
+        return age >= 18
+
+# Example usage
+imran = Person("Imran", date(2001, 5, 15), "Ubuntu")
+print(imran)  # Prints Person(name='Imran', date_of_birth=datetime.date(2001, 5, 15), preferred_operating_system='Ubuntu')
+print(imran.is_adult())  # Prints True or False depending on the current date

enums.py

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+from dataclasses import dataclass
+from enum import Enum
+
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    UBUNTU = "Ubuntu"
+    ARCH = "Arch Linux"
+
+@dataclass
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+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),
+]
+
+@dataclass
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: OperatingSystem
+
+
+name = input('Please enter your name: ')
+
+age_input = input('Please enter your age: ')
+try:
+    age = int(age_input)
+except ValueError:
+    print(f"Age must be a number")
+    exit()
+
+preferred_os_input = input('Please enter your preferred operating system: ')
+try:
+    preferred_operating_system = OperatingSystem(preferred_os_input)
+except ValueError:
+    print(f'We are not offering {preferred_os_input}. Please choose from the following list: {[os.value for os in OperatingSystem]}')
+    exit()
+
+
+
+person = Person(name=name, age=age, preferred_operating_system=preferred_operating_system)
+
+
+number_of_available_laptops = sum(
+    1 for laptop in laptops if laptop.operating_system == person.preferred_operating_system
+)
+
+def offer_laptop_to_user()->None:
+    offer = input('Would you like a laptop with this OS (yes / no) ? ')
+    if offer.lower() == "y" or offer.lower() == "yes":
+        print(f'Great! Please come on monday next week to collect your laptop')
+    else:
+        print('No problem. See you later.')
+
+if number_of_available_laptops == 1:
+    print(f'There is {number_of_available_laptops} laptop available with your preferred operating system.')
+    offer_laptop_to_user()
+elif number_of_available_laptops > 1:
+    print(f'There are {number_of_available_laptops} laptops available with your preferred operating system.')
+    offer_laptop_to_user()
+else:
+    print('There are no laptops available with your preferred operating system.')
+
+

generics.py

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+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=25, children=[])
+aisha = Person(name="Aisha",age=30, children=[])
+
+imran = Person(name="Imran", age=50, 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)

inheritance.py

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+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: list[str] = []
+
+    def change_last_name(self, last_name:str) -> 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()) # will thrown an error since get_full_name does not exist in parent class
+# person2.change_last_name("Tyurina") # will thrown an error since change_last_name method does not exist in parent class
+print(person2.get_name())
+# print(person2.get_full_name()) # will thrown an error since get_full_name does not exist in parent class

methods.py

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+from datetime import date
+
+class Person:
+    def __init__(self, name: str, DoB: date, preferred_operating_system: str):
+        self.name = name
+        self.DoB = DoB
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self)-> bool:
+        current_date = date.today()
+        age = current_date.year - self.DoB.year - (
+            (current_date.month, current_date.day) < (self.DoB.month, self.DoB.day)
+        )
+        return age >= 18
+
+imran = Person("Imran", date(1998, 1, 6), "Ubuntu")
+print(imran.is_adult())

requirements.txt

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+mypy

type_guided_refac.py

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+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:
+        if laptop.operating_system in person.preferred_operating_systems:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu", "Arch Linux", "macOS"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["Arch Linux", "macOS", "Ubuntu" ]),
+]
+
+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}")
+

type_with_mypy.py

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+def open_account(balances:dict[str, float], name:str, amount:float)-> None:
+    balances[name] = amount
+
+def sum_balances(accounts:dict[str, float])->float:
+    total = 0.00
+    for name, pence in accounts.items():
+        print(f"{name} had balance {pence}")
+        total += pence
+    return total
+
+def format_pence_as_string(total_pence:float) -> str:
+    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": 7.00,
+    "Linn": 5.45,
+    "Georg": 8.31,
+}
+
+open_account(balances, "Tobi", 9.13)
+open_account(balances, "Olya", 7.13)
+
+total_pence = sum_balances(balances)
+total_string = format_pence_as_string(total_pence)
+
+print(f"The bank accounts total {total_string}")

why-we-use-type.py

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+def half(value):
+    return value / 2 
+
+def double(value):
+    return value * 2 
+
+def second(value):
+    return value[1]
+
+
+
+# print(half(22))
+# print(half("hello"))
+# print(half("22"))
+
+# print(double(22))
+# print(double("hello"))
+# print(double("22"))
+
+# print(second(22))
+# print(second(0x16))
+# print(second("hello"))
+# print(second("22"))
+
+print(double("22")) # will print 2222
+
+def triple(number):
+    return number * 3
+
+print(triple(10))