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Merge pull request mouredev#4830 from qwik-zgheib/main
#26-27 - Go & Python
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‎Roadmap/26 - SOLID SRP/go/qwik-zgheib.go‎

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package main
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import "fmt"
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/* -- Exercise */
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type User struct {
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Name string
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Email string
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}
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/* -- exercise -- incorrect */
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func (u *User) Save() {
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fmt.Printf("Saving user %s to the database\n", u.Name)
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}
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func (u *User) SendEmail() {
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fmt.Printf("Sending email to %s\n", u.Email)
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}
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/* -- exercise -- correct */
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type UserRepository struct{}
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func (repo *UserRepository) Save(user User) {
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fmt.Printf("Saving user %s to the database\n", user.Name)
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}
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type EmailService struct{}
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func (service *EmailService) SendEmail(user User) {
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fmt.Printf("Sending email to %s\n", user.Email)
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}
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/* -- Extra Challenge */
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type Book struct {
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Title string
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Author string
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Copies int
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}
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type UserT struct {
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Name string
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ID string
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Email string
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}
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/* -- extra challenge - incorrect */
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type Library struct {
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Books []Book
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Users []UserT
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Loans map[string]string // map[userID]bookTitle
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}
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func (lib *Library) AddBook(book Book) {
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lib.Books = append(lib.Books, book)
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fmt.Printf("Book '%s' by '%s' added to the library.\n", book.Title, book.Author)
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}
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func (lib *Library) AddUser(user UserT) {
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lib.Users = append(lib.Users, user)
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fmt.Printf("User '%s' added to the library.\n", user.Name)
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}
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func (lib *Library) LoanBook(userID, bookTitle string) {
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lib.Loans[userID] = bookTitle
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fmt.Printf("User '%s' loaned book '%s'.\n", userID, bookTitle)
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}
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/* -- extra challenge - correct */
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type BookRepositoryC struct {
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Books []Book
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}
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func (repo *BookRepositoryC) AddBook(book Book) {
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repo.Books = append(repo.Books, book)
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fmt.Printf("Book '%s' by '%s' added to the library.\n", book.Title, book.Author)
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}
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type UserRepositoryC struct {
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Users []UserT
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}
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func (repo *UserRepositoryC) AddUserC(user UserT) {
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repo.Users = append(repo.Users, user)
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fmt.Printf("User '%s' added to the library.\n", user.Name)
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}
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type LoanService struct {
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Loans map[string]string // map[userID]bookTitle
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}
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func (service *LoanService) LoanBook(userID, bookTitle string) {
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service.Loans[userID] = bookTitle
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fmt.Printf("User '%s' loaned book '%s'.\n", userID, bookTitle)
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}
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func main() {
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/* Exercise */
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user := User{Name: "Legion Commander", Email: "legioncommander@gmail.com"}
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/* -- incorrect use */
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user.Save()
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user.SendEmail()
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/* -- correct use */
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userRepo := UserRepository{}
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userRepo.Save(user)
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emailService := EmailService{}
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emailService.SendEmail(user)
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/* Extra Challenge */
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/* -- incorrect use */
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library := &Library{
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Books: []Book{},
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Users: []UserT{},
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Loans: make(map[string]string),
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}
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library.AddBook(Book{Title: "1984", Author: "George Orwell", Copies: 3})
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library.AddUser(UserT{Name: "Legion Commander", ID: "xyz-123", Email: "legioncommander@gmail.com"})
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library.LoanBook("xyz-123", "1984")
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/* -- correct use */
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bookRepoC := &BookRepositoryC{Books: []Book{}}
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userRepoC := &UserRepositoryC{Users: []UserT{}}
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loanService := &LoanService{Loans: make(map[string]string)}
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bookRepoC.AddBook(Book{Title: "1984", Author: "George Orwell", Copies: 3})
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userRepoC.AddUserC(UserT{Name: "Legion Commander", ID: "xyz-123", Email: "legioncommander@gmail.com"})
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loanService.LoanBook("123", "1984")
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}

‎Roadmap/26 - SOLID SRP/python/qwik-zgheib.py‎

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# -- exercise
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# incorrect
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class HeroI:
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def __init__(self, name, primary_attribute, base_damage, health):
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self.name = name;
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self.primary_attribute = primary_attribute;
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self.base_damage = base_damage;
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self.health = health;
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def calculate_damage(self, additional_damage):
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return self.base_damage + additional_damage;
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def display_info(self):
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info = f"Hero: {self.name}\n";
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info += f"Primary Attribute: {self.primary_attribute}\n";
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info += f"Base Damage: {self.base_damage}\n";
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info += f"Health: {self.health}";
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return info;
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hero = HeroI("Axe", "Strength", 50, 1000);
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print(hero.display_info());
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print(f"Damage: {hero.calculate_damage(20)}");
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# correct
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class HeroC:
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def __init__(self, name, primary_attribute, base_damage, health):
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self.name = name;
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self.primary_attribute = primary_attribute;
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self.base_damage = base_damage;
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self.health = health;
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class DamageCalculator:
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def calculate_damage(self, hero, additional_damage):
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return hero.base_damage + additional_damage;
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class HeroDisplay:
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def display_info(self, hero):
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info = f"Hero: {hero.name}\n"
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info += f"Primary Attribute: {hero.primary_attribute}\n";
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info += f"Base Damage: {hero.base_damage}\n";
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info += f"Health: {hero.health}";
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return info;
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print("------------------------------------------------")
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hero = HeroC("Axe", "Strength", 50, 1000);
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damage_calculator = DamageCalculator();
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hero_display = HeroDisplay();
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print(hero_display.display_info(hero))
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print(f"Damage: {damage_calculator.calculate_damage(hero, 20)}");
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# -- extra challenge
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# incorrect
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class Library:
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def __init__(self):
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self.books = [];
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self.users = [];
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self.loans = [];
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def add_book(self, title, author, copies):
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book = {"title": title, "author": author, "copies": copies};
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self.books.append(book);
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def add_user(self, name, user_id, email):
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user = {"name": name, "user_id": user_id, "email": email};
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self.users.append(user);
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def loan_book(self, user_id, book_title):
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for book in self.books:
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if book["title"] == book_title and book["copies"] > 0:
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self.loans.append({"user_id": user_id, "book_title": book_title});
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book["copies"] -= 1;
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return True;
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return False;
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def return_book(self, user_id, book_title):
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for loan in self.loans:
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if loan["user_id"] == user_id and loan["book_title"] == book_title:
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self.loans.remove(loan);
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for book in self.books:
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if book["title"] == book_title:
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book["copies"] += 1;
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return True;
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return False;
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library = Library()
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library.add_book("1996", "Ahmed Khedr", 4);
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library.add_user("Legion Commander", 1, "legioncommander@gmail.com");
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library.loan_book(1, "1996");
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library.return_book(1, "1996");
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# correct
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class BookManager:
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def __init__(self):
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self.books = [];
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def add_book(self, title, author, copies):
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book = {"title": title, "author": author, "copies": copies};
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self.books.append(book);
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def update_copies(self, book_title, copies):
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for book in self.books:
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if book["title"] == book_title:
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book["copies"] += copies;
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return True;
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return False;
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def get_book(self, book_title):
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for book in self.books:
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if book["title"] == book_title:
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return book;
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return None;
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class UserManager:
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def __init__(self):
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self.users = [];
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def add_user(self, name, user_id, email):
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user = {"name": name, "user_id": user_id, "email": email};
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self.users.append(user);
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def get_user(self, user_id):
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for user in self.users:
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if user["user_id"] == user_id:
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return user;
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return None;
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class LoanManager:
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def __init__(self, book_manager):
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self.loans = [];
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self.book_manager = book_manager;
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def loan_book(self, user_id, book_title):
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book = self.book_manager.get_book(book_title);
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if book and book["copies"] > 0:
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self.loans.append({"user_id": user_id, "book_title": book_title});
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self.book_manager.update_copies(book_title, -1);
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return True;
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return False;
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def return_book(self, user_id, book_title):
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for loan in self.loans:
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if loan["user_id"] == user_id and loan["book_title"] == book_title:
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self.loans.remove(loan);
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self.book_manager.update_copies(book_title, 1);
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return True;
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return False;
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# Uso correcto
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book_manager = BookManager();
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user_manager = UserManager();
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loan_manager = LoanManager(book_manager);
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book_manager.add_book("1996", "Ahmed Khedr", 4);
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user_manager.add_user("Legion Commander", 1, "legioncommander@gmail.com");
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loan_manager.loan_book(1, "1996");
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loan_manager.return_book(1, "1996");
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