training day7

                               Classes In Python

Constructor in python  by default it is pre- defined that is __init__( )

Example :

class persons:

def __init__(self,name,age);

      self.name =  name

      self.age = age

p1 = persons("John",30) 

print(p1.name)

print(p1.age)

Self is the reference to current instance of class. We can access variables belonging to class using self keyword.

Example : 

def __init__(self,name,age):

    self.name = name

    self.age = age

def myfunction(self):

   print("Hello! my name = " + self.name + " and age = " + self.age)

p1.persons("John",30)

p1.myfunction()

we can write anything instead of self, but first parameter will always be a the instance.

If we want to delete any variable from class

class person:

def __init__(self,name,age):

     self.name = name

     self.age    =  age

def myfunction(self):

print("Hello,my name is " + self.name +" and age = " " + self.age"))

p1 = person("John",30)

del p1.age

p1.myfunction( )