Glasgow | 26- SDC-Mar | Taras Mykytiuk | Sprint 5 | Prep exercises

sprint5-prep-exercises/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(person: Person) -> bool:
+    return person.age >= 18
+
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.name)
+# there is no property 'address' in Person class
+# print(imran.address)
+print(is_adult(imran))
+
+eliza = Person("Eliza", 34, "Arch Linux")
+print(eliza.name)
+# there is no property 'address' in Person class
+# print(eliza.address)

sprint5-prep-exercises/dataclasses_ex.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()
+        full_years = current_date.year - self.date_of_birth.year
+        if (current_date.month < self.date_of_birth.month) or (
+            current_date.month == self.date_of_birth.month
+            and current_date.day < self.date_of_birth.day
+        ):
+            full_years -= 1
+        return full_years >= 18
+
+
+imran = Person("Imran", date(2008, 1, 30), "Ubuntu")
+print(imran)
+print("Imran is adult: " + str(imran.is_adult()))

sprint5-prep-exercises/double.py

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+def double(value):
+    return value * 2
+
+
+def double2(number):
+    return number * 3
+
+
+def main():
+    # "22" is a string --> it will return string: "2222"
+    print(double("22"))
+    # in this function that expected to double the number, it multiplied by 3 ( probably accidental mistype)
+    print(double2(10))  # return 30 instead of 20
+
+
+if __name__ == "__main__":
+    main()

sprint5-prep-exercises/enums.py

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+from enum import Enum
+
+from dataclasses import dataclass
+import sys
+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
+
+
+def operating_system_laptop_num(
+    laptops: List[Laptop], system: OperatingSystem
+) -> List[Laptop]:
+    sys_laptops = []
+    for laptop in laptops:
+        if laptop.operating_system == system:
+            sys_laptops.append(laptop)
+    return sys_laptops
+
+
+def inputPerson() -> dict:
+    name = input("Enter name: ")
+    age = int(input("Enter age: "))
+    systemStr = input("Enter preferred operating system: ")
+    system = None
+    for system_variant in OperatingSystem:
+        if systemStr.lower() == system_variant.name.lower():
+            system = system_variant
+    if system == None:
+        print("Incorrect operating system input.")
+        return {}
+
+    return {"name": name, "age": age, "system": system}
+
+
+def main():
+    input = inputPerson()
+    if len(input) == 0:
+        return
+
+    newPerson = Person(input["name"], input["age"], input["system"])
+    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,
+        ),
+    ]
+
+    preferred_laptops_num = len(find_possible_laptops(laptops, newPerson))
+    max_other_laptops = 0
+    other_laptops_sys = None
+    for system_variant in OperatingSystem:
+        if system_variant == input["system"]:
+            continue
+        laptops_num = len(operating_system_laptop_num(laptops, system_variant))
+        if laptops_num > preferred_laptops_num:
+            max_other_laptops = laptops_num
+            other_laptops_sys = system_variant
+
+    print(
+        "We have "
+        + str(preferred_laptops_num)
+        + " with "
+        + input["system"].name
+        + " installed."
+    )
+    if max_other_laptops > 0:
+        print(
+            "We also have "
+            + str(max_other_laptops)
+            + " with "
+            + other_laptops_sys.name
+            + " installed."
+        )
+
+
+if __name__ == "__main__":
+    main()

sprint5-prep-exercises/generics.py

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+from dataclasses import dataclass
+from typing import List
+from datetime import date
+
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    date_of_birth: date
+    children: List["Person"]
+
+    def getAge(self) -> int:
+        current_date = date.today()
+        full_years = current_date.year - self.date_of_birth.year
+        if (current_date.month < self.date_of_birth.month) or (
+            current_date.month == self.date_of_birth.month
+            and current_date.day < self.date_of_birth.day
+        ):
+            full_years -= 1
+        return full_years
+
+
+fatma = Person(name="Fatma", date_of_birth=date(2020, 4, 12), children=[])
+aisha = Person(name="Aisha", date_of_birth=date(2024, 7, 5), children=[])
+
+imran = Person(name="Imran", date_of_birth=date(2000, 1, 30), children=[fatma, aisha])
+
+
+def print_family_tree(person: Person) -> None:
+    print(person.name)
+    for child in person.children:
+        print(f"- {child.name} ({child.getAge()})")
+
+
+print_family_tree(imran)

sprint5-prep-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_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())
+
+# class person has no methods get_full_name() and change_last_name()
+# when program will reach lines with this methods applied to person class it will throw an error
+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())

sprint5-prep-exercises/methods.py

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+from datetime import date
+
+
+class Person:
+
+    def __init__(self, name: str, date_of_birth: date):
+        self.name = name
+        self.date_of_birth = date_of_birth
+
+    def is_adult(self) -> bool:
+        current_date = date.today()
+        full_years = current_date.year - self.date_of_birth.year
+        if (current_date.month < self.date_of_birth.month) or (
+            current_date.month == self.date_of_birth.month
+            and current_date.day < self.date_of_birth.day
+        ):
+            full_years -= 1
+        return full_years >= 18
+
+
+imran = Person("Imran", date(2008, 1, 30))
+eliza = Person("Eliza", date(2088, 7, 30))
+someone = Person("Someone", date(2021, 7, 30))
+print("Imran is adult: " + str(imran.is_adult()))
+print("Eliza is adult: " + str(eliza.is_adult()))
+print("Someone is adult: " + str(someone.is_adult()))

sprint5-prep-exercises/type_checking.py

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+def open_account(balances: dict, name: str, amount: int) -> None:
+    balances[name] = amount
+
+
+def sum_balances(accounts: dict) -> 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,
+}
+
+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}")