Merge pull request bradtraversy#10 from rooky1905/master

bradtraversy · web-flow · commit ba14199e32fb · 2020-10-19T09:37:33.000-04:00
Added Encapsulation and improved Inheritance
diff --git a/python_sandbox_finished/classes.py b/python_sandbox_finished/classes.py
@@ -2,33 +2,41 @@
 
 # Create class
 class User:
+
   # Constructor
   def __init__(self, name, email, age):
     self.name = name
     self.email = email
     self.age = age
+    
+    # Adding Encapsulation of variables... Encapsulation is the concept of making the variables non-accessible or accessible upto some extent from the child classes
+    self._private = 1000 # Encapsulated variables are declares with '_' in the constructor.
 
   def greeting(self):
-    return f'My name is {self.name} and I am {self.age}'
+      return f'My name is {self.name} and I am {self.age}'
 
   def has_birthday(self):
-    self.age += 1
-
+      self.age += 1
+ 
+ #function for encap variable
+  def print_encap(self):
+      print(self._private)
 
 # Extend class
 class Customer(User):
   # Constructor
   def __init__(self, name, email, age):
-    self.name = name
-    self.email = email
-    self.age = age
-    self.balance = 0
+      User.__init__(self, name, email, age) #Called proper parent class constructor to make this as proper child inehriting all methods.
+      self.name = name
+      self.email = email
+      self.age = age
+      self.balance = 0
 
   def set_balance(self, balance):
-    self.balance = balance
+      self.balance = balance
 
   def greeting(self):
-    return f'My name is {self.name} and I am {self.age} and my balance is {self.balance}'
+      return f'My name is {self.name} and I am {self.age} and my balance is {self.balance}'
 
 #  Init user object
 brad = User('Brad Traversy', 'brad@gmail.com', 37)
@@ -39,4 +47,17 @@ def greeting(self):
 print(janet.greeting())
 
 brad.has_birthday()
-print(brad.greeting())
+print(brad.greeting())
+
+#Encapsulation -->
+brad.print_encap()
+brad._private = 800 #Changing for brad
+brad.print_encap()
+
+# Method inherited from parent
+janet.print_encap() #Changing the variable for brad doesn't affect janets variable --> Encapsulation
+janet._private = 600
+janet.print_encap()
+
+#Similary changing janet's doesn't affect brad's variable.
+brad.print_encap()
