London | 26 - JUL-SDC| Ping Wang |Sprint 5 |Spring 5 exercises-CYF 1155

.gitignore

@@ -1,2 +1,7 @@
+
 node_modules
 testoutput.txt
+
+.venv/
+__pycache__/
+*.pyc

Spring 5 exercises/checktype.py

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+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,
+    "George": 831,
+}
+
+open_account(balances,"Toby", 913)
+open_account(balances,"Olive", 713)
+
+total_pence = sum_balances(balances)
+total_string = format_pence_as_string(total_pence)
+
+print(f"The bank accounts total {total_string}")
+
+ # i amended three errors from original code from prep, line 28 function name is format_pence-as_string rather than format_pence_as_str, line 24 ad 25, supposed
+ # three arguments instead of 2, so i add balances when we call open_account and also call open_account amount should be integer rather than string or decimal

Spring 5 exercises/class.py

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+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str,address:str):
+        self.name = name
+        self.age = age
+        self.preferred_operating_system = preferred_operating_system
+        self.address=address
+
+amy = Person("Amy", 22, "Ubuntu", "23 main road")
+print(amy.name)
+
+eliza = Person("Eliza", 34, "Arch Linux","32 divert way")
+print(eliza.name)
+
+def is_adult(person: Person) -> bool:
+    return person.age >= 18
+
+print(is_adult(amy))
+
+def home_address(person :Person):
+    return person.address 
+
+print(home_address(eliza))

Spring 5 exercises/dataclass.py

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+from dataclasses import dataclass
+from datetime import date
+
+@dataclass
+class Person:
+    name : str
+    date_of_birth: date
+    preferred_operating_system: str
+
+    def is_adult(self) -> bool :
+        today = date.today()
+        age = today.year - self.date_of_birth.year
+
+        if (today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day):
+            age-=1
+
+        return age>=18   
+
+amy= Person("Amy", date(2011,11,23), "Ubuntu")  
+amy2= Person("Amy", date(2011,11,23), "Ubuntu") 
+
+print(amy)
+print(amy2)
+print(amy==amy2)
+print(amy.is_adult())
+
+
+

Spring 5 exercises/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"]
+
+france = Person(name="France", age=5, children=[])
+aisha = Person(name="Aisha", age= 1, children=[])
+
+amy = Person(name="Amy",age = 32, children=[france, 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(amy)

Spring 5 exercises/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_full_name(self) -> str:
+        return f"{self.first_name} {self.last_name}"
+
+    def change_last_name(self, last_name: str) -> None:
+        self.last_name = 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("Ella", "Alice")
+print(person1.get_full_name())
+person1.change_last_name("Tina")
+print(person1.get_full_name())
+
+person2 = Parent("Ella", "Alice")
+print(person2.get_full_name())
+person2.change_last_name("Tina")
+print(person2.get_full_name())

Spring 5 exercises/methods.py

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+ # Think of the advantages of using methods instead of free functions:
+ # Better organization, More readable code, Easier maintenance,Better editor support (autocomplete),Code reuse across all instances of the class
+ # Ease of documentation: Related data and behavior are grouped together, making the class easier to understand.
+ # Encapsulation: The implementation can change without affecting the rest of the program, as long as the method's interface stays the same.
+
+from datetime import date
+
+
+class Person:
+    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.today()
+
+        age=today.year- self.date_of_birth .year
+
+        if(today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day):
+           age-=1 
+
+        return age>=18
+
+amy = Person("Amy",date(2003,1,5), "Ubuntu")
+eliza = Person("Eliza",date(2012,11,25), "Ubuntu")
+
+print(amy.is_adult())
+print(eliza.is_adult())

Spring 5 exercises/operation.py

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+from dataclasses import dataclass
+from enum import Enum
+import sys
+
+
+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
+
+
+laptops = [
+    Laptop(1, "Dell", "XPS", 13, OperatingSystem.ARCH),
+    Laptop(2, "Dell", "XPS", 15, OperatingSystem.UBUNTU),
+    Laptop(3, "Dell", "XPS", 15, OperatingSystem.UBUNTU),
+    Laptop(4, "Apple", "MacBook", 13, OperatingSystem.MACOS),
+]
+
+
+# Read name
+name = input("Enter your name: ")
+
+# Read and convert age
+try:
+    age = int(input("Enter your age: "))
+except ValueError:
+    print("Error: age must be a whole number.", file=sys.stderr)
+    sys.exit(1)
+
+# Read and convert operating system
+print("Choose an operating system:")
+print("- Ubuntu")
+print("- Arch Linux")
+print("- macOS")
+
+while True:
+    os_input = input("Preferred operating system: ")
+
+    try:
+        preferred_os = OperatingSystem(os_input)
+        break
+    except ValueError:
+        print("Please choose Ubuntu, Arch Linux, or macOS.")
+
+# Create the person
+person = Person(name, age, preferred_os)
+
+# Find matching laptops
+matching = [
+    laptop
+    for laptop in laptops
+    if laptop.operating_system == person.preferred_operating_system
+]
+
+print(
+    f"\nThe library has {len(matching)} laptop(s) running "
+    f"{person.preferred_operating_system.value}."
+)
+
+# Count laptops for each operating system
+counts = {}
+
+for laptop in laptops:
+    os = laptop.operating_system
+    counts[os] = counts.get(os, 0) + 1
+
+best_os = max(counts, key=counts.get)
+
+if best_os != person.preferred_operating_system:
+    print(
+        f"If you're willing to accept {best_os.value}, "
+        f"there are {counts[best_os]} laptops available."
+    )

Spring 5 exercises/refactor.py

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+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: List [str]
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+        if person.preferred_operating_system in laptop.operating_system:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Amy", 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}")

Spring 5 exercises/type_exaple.py

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+def double(number):
+    return number * 3
+
+print(double(10))
+
+# Because double conflicts with multiplying 3 so we can change function name to 'triple' or '*2'
+
+def triple(number):
+    return number * 3
+
+print(triple(10))
+
+
+def double(number):
+    return number * 2
+
+print(double(10))