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Merge pull request mouredev#4604 from LuisOlivaresJ/main
#26-Python
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‎Roadmap/26 - SOLID SRP/python/LuisOlivaresJ.py‎

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# ---------------------------------------------
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# Ejemplo de Principio de responsabilidad única
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# ---------------------------------------------
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# El siguiente ejemplo muestra un código que viola el principio de responsabilidad única.
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# La clase ImageManager tiene dos responsabilidades:
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# 1.- Obtener estadísticas de una imagen
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# 2.- Graficar una imagen
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import matplotlib.pyplot as plt
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import numpy as np
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import logging
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class ImageManager:
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def __init__(self, array):
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self.array = array
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def get_statistics(self):
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return {
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"mean": np.mean(self.array),
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"std": np.std(self.array),
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}
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def plot(self):
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fig, ax = plt.subplots()
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ax.plot(self.array)
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plt.show()
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# Para cumplir con el principio de responsabilidad única, separamos las responsabilidades en dos clases diferentes.
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class ImageStatistics:
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def __init__(self, array):
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self.array = array
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def get_statistics(self):
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return {
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"mean": np.mean(self.array),
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"std": np.std(self.array),
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}
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class ImagePlotter:
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def __init__(self, array):
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self.array = array
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def plot(self):
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fig, ax = plt.subplots()
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ax.plot(self.array)
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plt.show()
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# ---------------------------------------------
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# Dificultad extra
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# Sistema de gestion para una bibioteca
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#
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# FORMA INCORRECTA
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#
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# ---------------------------------------------
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logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(message)s")
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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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def add_user(self, name: str, id: int, email: str):
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self.users.append({
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"name": name,
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"id": id,
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"email": email,
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"books": [],
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}
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)
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logging.info(f"User {name} added successfully")
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def add_book(self, title: str, author: str, copies: int):
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self.books.append({
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"title": title,
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"author": author,
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"copies": copies
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}
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)
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logging.info(f"Book {title} added successfully")
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def print_books(self):
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for book in self.books:
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print(f"\tTitle: {book['title']}, Author: {book['author']}, Copies: {book['copies']}")
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def print_users(self):
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for user in self.users:
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print(f"\tName: {user['name']}, ID: {user['id']}, Email: {user['email']}, Books: {user['books']}")
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def lend_book(self, title: str, name: str):
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for book in self.books:
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if book["title"] == title:
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if book["copies"] > 0:
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book["copies"] -= 1
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logging.info(f"Book {title} borrowed by user {name}")
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else:
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logging.info(f"Book {title} is not available")
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break
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else:
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logging.warning(f"Book {title} not found")
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for user in self.users:
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if user["name"] == name:
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user["books"].append(
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{
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"title": title,
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}
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)
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logging.info(f"Book {title} added to user {name}")
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break
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def return_book(self, title: str, name: str):
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for book in self.books:
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if book["title"] == title:
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book["copies"] += 1
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logging.info(f"Book {title} returned by user {name}")
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break
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else:
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logging.warning(f"Book {title} not found")
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for user in self.users:
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if user["name"] == name:
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for book in user["books"]:
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if book["title"] == title:
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user["books"].remove(book)
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logging.info(f"Book {title} removed from user {name}")
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break
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# Testing the class
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print("\n"*3)
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print("### Testing: Dificultad extra (FORMA INCORRECTA)\n")
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my_library = Library()
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my_library.add_user("Alice", 1, "alice@dev")
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my_library.add_user("Bob", 2, "bob@dev")
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my_library.add_book("The Hobbit", "J.R.R. Tolkien", 5)
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my_library.add_book("The Lord of the Rings", "J.R.R. Tolkien", 3)
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print("\nBooks in the library:")
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my_library.print_books()
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my_library.lend_book("The Hobbit", "Alice")
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print("\nBooks in the library:")
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my_library.print_books()
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my_library.print_users()
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my_library.return_book("The Hobbit", "Alice")
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my_library.print_books()
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my_library.print_users()
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# ---------------------------------------------
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# Dificultad extra
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# Sistema de gestion para una bibioteca
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#
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# Forma CORRECTA
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#
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# Se crean dos clases diferentes, BooksManager y UsersManager, para manejar los libros y a los usuarios.
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# Se crea una clase que maneja la biblioteca y delega las responsabilidades a las clases BooksManeger y UsersManager.
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# ---------------------------------------------
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class BooksManeger:
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def __init__(self):
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self.books = []
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def add_book(self, title: str, author: str, copies: int):
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self.books.append(
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{"title": title, "author": author, "copies": copies}
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)
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logging.info(f"Book {title} added successfully")
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def print_books(self):
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for book in self.books:
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print(f"\tTitle: {book['title']}, Author: {book['author']}, Copies: {book['copies']}")
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def lend_book(self, title: str):
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for book in self.books:
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if book["title"] == title:
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if book["copies"] > 0:
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book["copies"] -= 1
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logging.info(f"Book {title} borrowed")
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else:
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logging.info(f"Book {title} is not available")
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break
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else:
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logging.warning(f"Book {title} not found")
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def return_book(self, title: str):
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for book in self.books:
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if book["title"] == title:
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book["copies"] += 1
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logging.info(f"Book {title} returned")
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break
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else:
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logging.warning(f"Book {title} not found")
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class UsersManager:
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def __init__(self):
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self.users = []
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def add_user(self, name: str, id: int, email: str):
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self.users.append(
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{"name": name, "id": id, "email": email, "books": []}
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)
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logging.info(f"User {name} added successfully")
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def print_users(self):
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for user in self.users:
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print(f"\tName: {user['name']}, ID: {user['id']}, Email: {user['email']}, Books: {user['books']}")
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def lend_book(self, title: str, name: str):
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for user in self.users:
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if user["name"] == name:
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user["books"].append({"title": title})
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logging.info(f"Book {title} added to user {name}")
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break
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else:
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logging.warning(f"User {name} not found")
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def return_book(self, title: str, name: str):
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for user in self.users:
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if user["name"] == name:
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for book in user["books"]:
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if book["title"] == title:
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user["books"].remove(book)
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logging.info(f"Book {title} removed from user {name}")
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break
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break
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else:
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logging.warning(f"User {name} not found")
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class Library_v2:
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def __init__(self):
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self.books_m = BooksManeger()
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self.users_m = UsersManager()
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def add_user(self, name: str, id: int, email: str):
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self.users_m.add_user(name, id, email)
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def add_book(self, title: str, author: str, copies: int):
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self.books_m.add_book(title, author, copies)
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def print_books(self):
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self.books_m.print_books()
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def print_users(self):
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self.users_m.print_users()
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def lend_book(self, title: str, name: str):
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self.books_m.lend_book(title)
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self.users_m.lend_book(title, name)
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def return_book(self, title: str, name: str):
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self.books_m.return_book(title)
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self.users_m.return_book(title, name)
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# Testing the classes
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print("\n"*3)
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print("### Testing: Dificultad extra (FORMA CORRECTA)\n")
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my_library_v2 = Library_v2()
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my_library_v2.add_user("Alice", 1, "alice@dev")
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my_library_v2.add_user("Bob", 2, "bob@dev")
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my_library_v2.add_book("The Hobbit", "J.R.R. Tolkien", 5)
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my_library_v2.add_book("The Lord of the Rings", "J.R.R. Tolkien", 3)
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print("\nBooks in the library:")
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my_library_v2.print_books()
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my_library_v2.lend_book("The Hobbit", "Alice")
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print("\nBooks in the library:")
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my_library_v2.print_books()
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print("\nUsers in the library:")
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my_library_v2.print_users()
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my_library_v2.return_book("The Hobbit", "Alice")
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print("\nBooks in the library:")
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my_library_v2.print_books()
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print("\nUsers in the library:")
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my_library_v2.print_users()

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