ABSTRACTION OR DATA HIDING IN PYTHON

The concept of hiding the properties of one class from the other classes or other programs directly is known as data hiding or abstraction. (__ is prefix)

Example –

class A:
    __p=100
    def m1(self):
        print 'in m1 of A'
A1=A()
A1.m1()
print A.p

Output –

Traceback (most recent call last):

  File "C:/Users/om/PycharmProjects/Pythonn/if3.py", line 7, in <module>

in m1 of A

    print A.p

AttributeError: class A has no attribute 'p'

Example –

class Counter:
    __secretcount=0
    def count(self):
        self.__secretcount +=1
        print self.__secretcount
C=Counter()
C.count()
C.count()
print C.__secretcount

Output –

Traceback (most recent call last):

1

  File "C:/Users/om/PycharmProjects/Pythonn/if3.py", line 9, in <module>

2

    print C.__secretcount

AttributeError: Counter instance has no attribute '__secretcount'