#23 Python and gO

Author: raynerpv2022

Roadmap/23 - SINGLETON/go/raynerpv2022.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+)
+
+type User struct {
+	Name  string
+	Id    int
+	Email string
+}
+
+var einMal sync.Once
+var UserUser *User
+
+func GetI() *User {
+	einMal.Do(func() {
+		UserUser = &User{"", 0, ""}
+	})
+	return UserUser
+}
+
+func (u *User) SetUser(name string, id int, email string) {
+	u.Name = name
+	u.Id = id
+	u.Email = email
+
+}
+
+func (u *User) GetUser() string {
+	if u != nil {
+		return fmt.Sprintf(" Name %v, Id %v, Email %v", u.Name, u.Id, u.Email)
+	}
+	return "User is Nil"
+
+}
+
+func (u *User) DeleteUser() {
+	u.Name = ""
+	u.Id = 0
+	u.Email = ""
+}
+
+func main() {
+	fmt.Println(("Singleton"))
+
+	user1 := GetI()
+	user2 := GetI()
+	user1.SetUser("Periko", 10001, "[email protected]")
+
+	fmt.Println(user1.GetUser())
+	fmt.Println(user2.GetUser())
+	user3 := GetI()
+	user3.DeleteUser()
+	fmt.Println(user1.GetUser())
+	fmt.Println(user2.GetUser())
+	fmt.Println(user3.GetUser())
+}

Roadmap/23 - SINGLETON/python/raynerpv2022.py

@@ -0,0 +1,76 @@
+# /*
+#  * EJERCICIO:
+#  * Explora el patrón de diseño "singleton" y muestra cómo crearlo
+#  * con un ejemplo genérico.
+#  *
+#  * DIFICULTAD EXTRA (opcional):
+#  * Utiliza el patrón de diseño "singleton" para representar una clase que
+#  * haga referencia a la sesión de usuario de una aplicación ficticia.
+#  * La sesión debe permitir asignar un usuario (id, username, nombre y email),
+#  * recuperar los datos del usuario y borrar los datos de la sesión.
+#  */
+
+class PaternSin:
+
+    _inst = None
+    
+
+    def __new__(qq):
+        if qq._inst == None:
+            qq._inst = super(PaternSin,qq).__new__(qq)
+            qq._inst.name = ["tiburcio"] #name es variable de instancia
+         
+        return qq._inst
+    
+    def SetName(self, name):
+        self.name.append(name)
+
+p1 = PaternSin()
+p2 = PaternSin()
+p3 = PaternSin()
+
+print(p1,p2,p3)
+print(p1 is p2 is p3)
+print("p1", p1.name)
+p1.SetName("segundo")
+print("p2", p2.name)
+p3.SetName("tercero")
+print("p3", p3.name)
+print("p1", p1.name)
+print("p2", p2.name)
+
+# EXTRA 
+
+class User:
+
+    _instance = None
+
+    def __new__(cls):
+        if cls._instance == None:
+            cls._instance = super(User,cls).__new__(cls)
+            cls._instance.ID = 1001
+            cls._instance.Name = "Federico"
+            cls._instance.User_Name = "fedrico_makiavelo"
+            cls._instance._instance.email = "[email protected]"
+        return cls._instance
+    
+    def Get_User(self):
+        return f" Name {self.Name} User {self .User_Name} ID {self.ID} email {self.email}"
+
+    def Delete_User(self):
+        self.ID = None
+        self.Name = None
+        self.User_Name = None
+        self.email = None
+    
+    
+
+U1 = User()
+U2 = User()
+
+print(U1.Get_User())
+print(U2.Get_User())
+U1.Delete_User()
+print(U1.Get_User())
+print(U2.Get_User())
+