Python __delete__() Magic Method

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Python’s magic method __delete__() is called to delete an instance’s attribute. For example, the expression del my_obj.attr would result in attr.__delete__(my_obj), so you’d give the attribute itself the responsibility for its deletion on my_obj.

We call this a “Dunder Method” for Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat sheet article on this blog.

Syntax and Example

object.__delete__(self, instance)

Let’s have a look at an example:

class My_Attribute:
    def __delete__(self, instance):
        print('hello world')
class MyClass:
    attr = My_Attribute()

my_obj = MyClass()
del my_obj.attr
# hello world


Where to Go From Here?

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