Add getter-setter methods example

OOP/P12_GetterSetterMethods.py

@@ -0,0 +1,37 @@
+'''
+Author: AMIT PATHAK 
+
+In this example, we will the getter and setter methods in python class.
+Private variables of a class cannot be accessed outside the class using the class object.
+In order to access or manipulate these variables, we make use of getter and setter methods respectively.
+'''
+
+class CreditCard(object):
+
+    def __init__(self, number, new_pin):
+        self.card_number = number
+        self.__pin       = new_pin     # Private Variable
+
+    def get_pin(self):
+        return self.__pin
+
+    def set_pin(self, new_pin):
+        self.__pin = new_pin
+
+
+if __name__ == '__main__':
+
+    cc = CreditCard(number=514235895214, new_pin=1234)
+
+    print(cc.card_number)
+    ### Output: 514235895214
+
+    #print(cc.__pin)
+    ### Output: AttributeError: 'CreditCard' object has no attribute '__pin'
+
+    print(cc.get_pin())
+    ### Output: 1234
+
+    cc.set_pin(new_pin=8745)   # Set a new pin to 8745
+    print(cc.get_pin())
+    ### Output: 8745

README.md

@@ -57,6 +57,7 @@ Pune, Maharashtra, India.<br />
 6. [Multiple Inheritance](https://github.com/OmkarPathak/Python-Programs/blob/master/OOP/P08_MultipleInheritence.py)
 7. [Private Variables](https://github.com/OmkarPathak/Python-Programs/blob/master/OOP/P10_PrivateVariable.py)
 8. [Magic Methods](https://github.com/OmkarPathak/Python-Programs/blob/master/OOP/P11_MagicMethods.py)
+9. [Getter & Setter Methods](https://github.com/OmkarPathak/Python-Programs/blob/master/OOP/P12_GetterSetterMethods.py)
 
 ## Trees