get() and set() methods in python

Accessing private variables from another class:

• One class cannot access the private information from another class directly.
• A class(object) is allowed to share(send or receive) the private data in communication.
• Communication between objects is possible using methods.
• Two standard methods get() and set() to share the information.

class First:
    __a = 10
    def getA():
        return First.__a

class Second:
    def main():
        # print("a val : ", First.__a)
        print("a val : ", First.getA())
        return

Second.main()

Accessing dynamic private variable using dynamic get() method:

class First:
    def __init__(self,a):
        self.__a = a
        return

    def getA(self):
        return self.__a
        
class Second:
    def main():
        obj = First(10)
        # print("a val : ", obj.__a)
        print("a val : ", obj.getA())
        return

Second.main()

Modifying private variables data:

• We cannot set values directly to private variables.
• We use set() method to modify the data.

Note: When we try set the value directly to private variable, the value will be omitted.

class First:
    __a=10
    def getA():
        return First.__a
    def setA(a):
        First.__a = a
        return

class Second:
    def main():
        print("a val :", First.getA())
        First.__a=20
        print("a val :", First.getA())
        First.setA(20)
        print("a val :", First.getA())
        return

Second.main()

Setting values to dynamic private variables:

class First:
    def __init__(self,a):
        self.__a = a
        return
    def getA(self):
        return self.__a
    def setA(self,a):
        self.__a = a
        return

class Second:
    def main():
        obj = First(10)
        print("a val :", obj.getA())
        obj.setA(20)
        print("a val :", obj.getA())
        return

Second.main()