Find object in a python list using the 'in' operator

Question

Is it possible to do something that looks like this:

if obj in a_list_of_the_same_obj_type:
     #do stuff

My obj already have the __eq__ and __ne__ function that compare on an attribute so I thought the in keyword would call it but it doesn't look like it does.

Answer 1

In this case, operator 'in' calls the __contains__() of python´s built-in list object which then calls the __eq__() of your object, so make sure that the __eq__() dunder method in your obj-class is properly implemented.

Answer 2

You need to implement __contains__ to be able to test for membership