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Python Classes:       Class Variables/Attributes and Static Methods

Python Classes can have instance variables and Class Variables. Instance variables are bound to instance of the Object Only, Where as Class Variables all objects of the class share same meory location. i.e Instance variables has different memory locations for each object, Where as class variables has single memory location for all Objects of that class.

class Employee:
  count=0;  # class variable/attribute
 
  def __init__(self,name,salary):
 
   self.name=name
   self.salary=salary
   Employee.count+=1 #class variable incremented by 1
 
  
  @staticmethod
  def display():
    print("Number of Employees ",Employee.count)  #prints count of the Employees
 
 
     
e1=Employee("abc",774748)
e2=Employee("aa",8383883)
Employee.display()


e2=Employee("jhk",788838)
Employee.display()      	

----------------------Output----------------------------
 Number of Employees  2
Number of Employees  3
     	
      	

    The above class Employee has class variable/attribute count, which is associated with Class itself,rather than Object.
i.e <className>.<class variable> Class variables count are accessed with Class name Employee
Employee count is incremented everytime new employee object is created. Constructor __init__ calls Employee.count += 1 , has number of Employee Objects are created

Static methods

      		<<ClassName>>.<<staticMethod>>
      	

>>>   Private Variables and Private Methods