Python_OOP_Class_Structure.py

class Employee:

    ## class attribute
    alias = 'Data Management'

    def __init__(self, position,age,salary,experience):     
    ## Instance attributes
        self.position = position
        self.age = age
        self.salary = salary
        self.experience = experience
   
# instance or object
obj = Employee("Developer", 29,50000,5)
## accessing class members
print(obj.position)   ## accessing self.position
print(obj.age)        ## accessing self.age
print(Employee.age)   ## Error (Instance attributes only be access by a instance of the class)
print(obj.alias)      ## Data Management  
print(Employee.alias) ## Data Management (a class attribute can be access by instacen and classs itself)

-----------------------OUTPUT FOR EACH PRINT()-------------------------------
Developer
29
AttributeError: type object 'Employee' has no attribute 'age'
Data Management
Data Management