# data encapsulation example in python
class Encapsulation(object):
    def __init__(self, a, b, c):
        self.public = a
        self._protected = b
        self.__private = c

 # instructor and destructor in python
class Account(object): 
    counter = 0
    def __init__(self, holder, number, balance,credit_line=1500): 
        Account.counter += 1
        self.__Holder = holder 
        self.__Number = number 
        self.__Balance = balance
        self.__CreditLine = credit_line
    def __del__(self):
        Account.counter -= 1

 # inheritance in python
class Counter(object): 
    number = 0 
 
    def __init__(self): 
        type(self).number += 1 
 
    def __del__(self): 
        type(self).number -= 1

class Account(Counter): 
    def __init__(self, 
                 account_holder,  
                 account_number, 
                 balance, 
                 account_current=1500): 
        Counter.__init__(self)

 # Multiple Inheritance in python 
# just wow!!! =| C# does not have this one =D
# but who cares about C#?
# wait! someone said it is possible to C# also
# but Who cares about simulated multiple inheritance via interfaces?

class NN (class1, class2, class3 ...):
...