oops in python

#encapsulation

#protected access modifier

class parent:
    # constructor
    def __init__(self):
        self._a=9
class child(parent):
      def __init__(self):
    #calling constructor in above
        parent.__init__(self)  
        print(f'calling 1st one:{self._a}')
        self._a=7
        print(f'calling 2nd one:{self._a}')
        self._a=5
        print(f'calling 3rd one:{self._a}')    
       
child()
# if i use print method it will show object also for example
print()
print(child())
print()
#creating object and accessing it
ob=parent()
ob1=child()
print(f'accseing parent class:{ob._a}')
print(f'accseing child class:{ob1._a}')#it always takes updated value
#o/p is:
calling 1st one:9 calling 2nd one:7 calling 3rd one:5 calling 1st one:9 calling 2nd one:7 calling 3rd one:5 <__main__.child object at 0x00000267DAAB62A0> calling 1st one:9 calling 2nd one:7 calling 3rd one:5 accseing parent class:9 accseing child class:5           


       

 #public access modifier

class fa:
    def __init__(self,name,age):
        self.na=name
        self.ae=age
    def age(self):
        #accesing data
        print(f'age is {self.ae}')  
obj_ct=fa('faizan',18)  
print(f'list of methods and data:{dir(obj_ct)}')  
print('name:',obj_ct.na)  
obj_ct.age()
#o/p is:
list of methods and data:['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'ae', 'age', 'na'] name: faizan age is 18
#protected access modifier
class fa:
    #protected data members
    _name=None
    _clg=None
    _branch=None
    #constuctor
    def __init__(self,name,clg,branch):
        self._name=name
        self._clg=clg
        self._branch=branch
    #protected data
    def  _data(self) :
        print(f'name:{self._name}')
        print(f'college:{self._clg}')
        print(f'branch:{self._branch}')
   #derived class    
class af(fa):
    #constructor
    def __init__(self, name, clg, branch):
        fa.__init__(self,name, clg, branch)
        #or super().__init__(name,clg,branch)
    #printing function
    def data2(self):
        self._data()
obj_1=fa('faizan','mbu','cse')
print(f'dir:{dir(obj_1)}')
obj_1._data()
print('')
obj_2=af('umar','vit','cse')
print(f'dir:{dir(obj_2)}')
obj_2.data2()          
#o/p is:
dir:['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_branch', '_clg', '_data', '_name'] name:faizan college:mbu branch:cse dir:['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_branch', '_clg', '_data', '_name', 'data2'] name:umar college:vit branch:cse
# public, protected,private in acccess modifier:
#creatung a super class
class parent():
    var=None #public
    _var1=None #protected
    __var1=None #private
    # constructor
    def __init__(self,var1,var2,var3):
        self.var=var1
        self._var1=var2
        self.__var1=var3
    #creating public function which can be acceseed anywhere
    def public(self):
        print(f'name:{self.var}')  
    #creating protected function which can be acceseed in subclass    
    def _protect(self):
        print(f'protected age is{self._var1}')
    #creating private function which can be acceseed only in one    
    def __priv(self):
        print(f'private is:{self.__var1}')
     #accesing private function
    def dispriv(self):
        self.__priv()
                     
class child(parent):
    # constructor
    def __init__(self, var1, var2, var3):
        super().__init__(var1, var2, var3)
     #accseing protected function  
    def porc(self):
        self._protect()    
 #creting and calling object  
ob=child('faizan',18,'mbu')
ob.public()
ob._protect()
ob.dispriv()
print()
# pivate function can also be called
#ob._parent__var1
print(f'private data{ob._parent__var1}')
print(f'protected data:{ob._var1}')
#o/p is:
name:faizan protected age is18 private is:mbu private datambu protected data:18 PS C:\third.py>


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