this magic-method i dont understand it i prefer to give me example for etch one

Question

__delitem__
__iter__
__contains__
if you give me example code i will be thankful for you

Answer 1

They would be implemented for your class only if meaningful...

__delitem__ : called when you want custom delete on you object item in form
delete obj[item]
https://docs.python.org/3/reference/datamodel.html#object.__delitem__

__iter__: called when you want an iterator for iterate on you object https://docs.python.org/3/reference/datamodel.html#object.__iter__

__contains__: called when you want check if an item is contained in your object
https://docs.python.org/3/reference/datamodel.html#object.__contains__

I repeat, these have to be implemented ONLY if meaningful and you want custom handling for respective case

Answer 2

what is the function should call it in main programme to call the __delitem__ and __iter__