View Discussion
Improve Article
Save Article
View Discussion
Improve Article
Save Article
Class Attribute: Class Attributes are unique to each class. Each instance of the class will have this attribute.
Example:
Python3
class Employee:
count = 0
def increase[self]:
Employee.count += 1
a1 = Employee[]
a1.increase[]
print[a1.count]
a2 = Employee[]
a2.increase[]
print[a2.count]
print[Employee.count]
Output:
1 2 2
In the above example, count variable is a class attribute.
Instance Attribute: Instance Attributes are unique to each instance, [an instance is another name for an object]. Every object/instance has its own attribute and can be changed without affecting other instances.
Example:
Python3
class Employee:
def __init__[self]:
self.name = 'Gfg'
self.salary =
4000
def show[self]:
print[self.name]
print[self.salary]
x = Employee[]
x.show[]
Output:
Gfg 4000
Now, Let’s see an example on properties:
1] Create Properties of a class using property[] function:
Syntax: property[fget, fset, fdel, doc]
Example:
Python3
class gfg:
def __init__[self, value]:
self._value = value
def getter[self]:
print['Getting value']
return self._value
def setter[self, value]:
print['Setting value to ' + value]
self._value = value
def
deleter[self]:
print['Deleting value']
del self._value
value = property[getter, setter, deleter, ]
x = gfg['Happy Coding!']
print[x.value]
x.value = 'Hey Coder!'
del x.value
Output:
Getting value Happy Coding! Setting value to Hey Coder! Deleting value
2]Create Properties of a class Using @property decorator:
We can apply the property function by using @property decorator. This is one of the built-in decorators. A decorator is simply a function that takes another function as an argument and adding to its behavior by wrapping it.
Example:
Python3
class byDeco:
def __init__[self, value]:
self._value = value
@property
def value[self]:
print['Getting value']
return self._value
@value.setter
def value[self, value]:
print['Setting value to ' + value]
self._value = value
@value.deleter
def value[self]:
print['Deleting value']
del self._value
x =
byDeco['happy Coding']
print[x.value]
x.value = 'Hey Coder!'
del x.value
Output:
Getting value happy Coding Setting value to Hey Coder! Deleting value
Table of difference between Attribute V/s Property
| Attributes are described by data variables for example like name, age, height etc. | Properties are special kind of attributes. |
Two types of attributes:
| It has getter, setter and delete methods like __get__, __set__ and __delete__ methods. |
| Class attributes are defined in the class body parts usually at the top. | We can define getters, setters, and delete methods with the property[]function. |
| Instance attribute are defined in the class body using self keyword usually it the __init__[] method. | If we just want to the read property, there is also a @property decorator which you can add above your method. |