delattr() to delete attribute of an object in Python

delattr(object, attribute) Removes the attribute of the input object
object (required ) , input object for which the attribute will be removed.
attribute ( required ), attribute to be removed.

Read more on Class Object and Attributes
Deleting an instance attribute

class Animal():
     #class attributes
    species='carnivores'

     #instance attributes
    def __init__(self1,name1,age):
        self1.name= name1
        self1.age=age

tiger=Animal("Ronald",5) # object created 
print(tiger.age) # 5
delattr(tiger,'age')
#print(tiger.age) # Error

In above code we created an object tiger. By using delattr() we removed one attribute age. The last line ( commented ) will generate error as we already removed the attribute age before using it.

AttributeError: 'Animal' object has no attribute 'age'

Deleting attribute of particular object.

We will create two objects and check that the delattr() will only delete for the input object only. Here in last line we can print the age of the other object lion.

tiger=Animal("Ronald",5) 
lion=Animal('Alex',6)
print(tiger.age) # 5 
delattr(tiger,'age')
print(lion.age) # 6

Deleting class attribute

Once the class attribute is removed, it is not available to all objects.

tiger=Animal("Ronald",5) 
lion=Animal('Alex',6)
print(tiger.species)
delattr(Animal,'species')
#print(tiger.species)
#print(lion.species)

Both the objects tiger and lion can't access the class attribute.

AttributeError: 'Animal' object has no attribute 'species'

Using del operator

tiger=Animal("Ronald",5) # object created 
print(tiger.age) # 5
del tiger.age
print(tiger.age) # Error

The last line will generate error as we have deleted the attribute before this line.
All Built in Functions in Python setattr() getattr() hasattr()

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