Making custom Attributes in Python

Question

I'm new to python so I don't know much. I was defining a function to work with lists and I want that function to be used like an attribute. For example to sort a list we use: list.sort()

Basically, instead of using the function like function(list) I want to use it like this: list.function()

For that you can define a class while inherit the inbuilt list class (so that you will be able use all the existing list methods) with methods as additional desired function/behavior. — Abhishek Kashyap
– Abhishek Kashyap, Commented Jan 19, 2023 at 17:12

mamo · Accepted Answer · 2023-01-19 16:19:06Z

1

You have to create a class

class MyClass():
    def function(self, param):
        print(param)

myClass = MYClass()
myClass.function()

You can see here or here for more details

answered Jan 19, 2023 at 16:19

mamo

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Michael Cao · Accepted Answer · 2023-01-19 16:24:59Z

1

You'll have to make a class that inherits the list class.

class MyList(list):
    def __init__(self, *args):
        super().__init__(*args)
        
    def all_caps(self):
        return [item.upper() if isinstance(item, str) else item for item in self]
    
mylist = MyList(['hi', 'hello', 1234])

mylist.all_caps()

answered Jan 19, 2023 at 16:24

Michael Cao

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3 Comments

Electric-Basket Over a year ago

But I'd have to convert the list to a MyList data type in order to use this, is there any way to just use a list directly?

Michael Cao Over a year ago

Not that I'm aware of. Is there a particular reason you want this behavior?

Electric-Basket Over a year ago

I'm making a function which will work with lists, and I want it to be used like the sort function in which we attribute listname in front of function.

Avad · Accepted Answer · 2023-01-19 16:37:29Z

0

You will have to create a custom class that inherit from original list and then using builtins module assign new extended class to previous list:

import builtins

class my_list(list):
  def f(self):
    return sum(self)

builtins.list = my_list


arr = list([1,2,3])
x = arr.f()
print(x)

Output:

Warning

Remember that you need to create every list using list() function to make sure your method will work.

answered Jan 19, 2023 at 16:37

Avad

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