Glasgow | Sheetal Kharab | Module-Decomposition | Sprint 4 | prep-exercises

.gitignore

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+node_modules/

bank_account.py

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+from typing import Dict
+def open_account(balances: Dict[str, int], name: str, amount: int)-> None:
+    balances[name] = amount
+
+def sum_balances(accounts:  Dict[str, int]) -> int:
+    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: int)-> 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": 700,
+    "Linn": 545,
+    "Georg": 831,
+}
+#missed balance argument, add balances
+open_account(balances,"Tobi", 913)
+#3rd argument is an int not a String and format as pence
+open_account(balances,"Olya", 713)
+
+total_pence = sum_balances(balances)
+#wrong name of function
+total_string = format_pence_as_string(total_pence)
+
+print(f"The bank accounts total {total_string}")

dataclass_person.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):
+        today = date.today()
+        birth_date= self.date_of_birth
+        #Calculate exact age by subtracting years
+        eighteen_years_ago = date(today.year - 18, today.month, today.day) 
+        return birth_date<= eighteen_years_ago  
+
+imran = Person("Imran", date(1989,6,25), "Ubuntu")  # We can call this constructor - @dataclass generated it for us.
+print(imran)  # Prints Person(name='Imran', date_of_birth=(1989, 6, 25), preferred_operating_system='Ubuntu')
+
+imran2 = Person("Imran", date(1989,6,25), "Ubuntu")
+print(imran == imran2)  # Prints True

double.py

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+def half(value):
+    return value / 2 
+
+def double(value):
+    return value * 2 
+
+def second(value):
+    return value[1]
+
+
+
+print(double(22))
+print(double("hello"))
+print(double("22")) 
+
+# In Python when we multiply a string by a number, it repeats the string that many times(in our case it is 2 times).
+# i got in answer 2222

enums.py

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+from dataclasses import dataclass
+from enum import Enum
+import sys
+from typing import List, Optional
+from collections import Counter
+
+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
+
+def parse_operating_system(s: str) -> Optional[OperatingSystem]:
+    s_normal = s.strip().lower()
+    for os in OperatingSystem:
+        if os.value.lower() == s_normal:
+            return os
+    return None
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_system=OperatingSystem.UBUNTU),
+    Person(name="Eliza", age=34, preferred_operating_system=OperatingSystem.ARCH),
+]
+
+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),
+]
+
+def input_name() -> str:
+    while True:
+        name = input("Enter your name: ")
+        if name == "":
+            print("Error: Name cannot be empty. Please try again.")
+        else:
+            return name
+
+def input_age() -> int:
+    while True:
+        try:
+            age_input = input("Enter your age: ")
+            age = int(age_input)
+            if age < 0:
+                raise ValueError("Age cannot be negative.")
+            return age
+        except ValueError as e:
+            print(f"Error: {e}", file=sys.stderr)
+
+def input_operating_system() -> OperatingSystem: 
+    while True:
+        os_input = input("Preferred operating system (macOS, Arch Linux, Ubuntu): ").strip()
+        preferred_os = parse_operating_system(os_input)
+        if preferred_os is not None:
+            return preferred_os
+        print("Please choose one of: macOS, Arch Linux, Ubuntu.")
+
+name = input_name()
+age = input_age()
+preferred_os = input_operating_system()
+
+
+# Create the Person with validated types 
+person = Person(name=name, age=age, preferred_operating_system=preferred_os) 
+people.append(person)   
+
+# Find matching laptops and print count 
+for person in people:
+    matching_laptops = find_possible_laptops(laptops, person)
+    print(f"\nHi {person.name}, we found {len(matching_laptops)} laptop(s) acc. your preferred OS ({person.preferred_operating_system.value}).")
+
+# Count how many laptops exist per OS using Counter
+os_counts = Counter(laptop.operating_system for laptop in laptops)
+
+# Find OS with most available laptops
+best_os = max(os_counts, key=lambda os: os_counts[os])
+best_count = os_counts[best_os]
+
+# Compare with user preferences 
+preferred_count = os_counts.get(person.preferred_operating_system, 0)
+
+if best_os != person.preferred_operating_system and best_count > preferred_count:
+    print(f"\n More laptops are available if you choose {best_os.value} ({best_count} available).")          

generic.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=11, children=[])
+aisha = Person(name="Aisha", age=13,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)

inheritence.py

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+
+from typing import List
+
+
+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)
+        # for type annotation as its a list of string 
+        self.previous_last_names : List[str]= []
+
+    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())
+# Need to Commented out because the Parent class doesn't have 'get_full_name()' and 'change_last_name()' methods
+#print(person2.get_full_name())
+#person2.change_last_name("Tyurina")
+print(person2.get_name())
+#print(person2.get_full_name())

laptops_allocate.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 == person.preferred_operating_systems:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["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}")

person.py

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+from datetime import date
+
+
+class Person:
+    # a constructor with a new instance of class
+    def __init__(self, name: str, date_of_birth:date, preferred_operating_system: str):
+        self.name = name
+        self.date_of_birth = date_of_birth
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self):
+        today_date = date.today()
+        birth_date= self.date_of_birth
+        #to check date and month as well
+        age = today_date.year-birth_date.year- ((today_date.month, today_date.day) < (birth_date.month, birth_date.day)) 
+        return age>=18
+
+
+imran = Person("Imran", date(1989,6,25), "Ubuntu")
+print(imran.name)
+print(imran.is_adult())
+
+eliza = Person("Eliza", date(2007,10,12), "Arch Linux")
+print(eliza.is_adult())
+
+
+

requirements.txt

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+mypy==1.18.2