Initiating an attribute in a class __init__: question

[buran]

When I write my below code everything works fine:

Note that this/original snippet and all the rest have one important difference - in the original snippet info_dict is class attribute and being mutable dict it is shared among all instances of the class, i.e. if you update the dict in one instance, it is also reflected in all instances.

In all the rest it's an instance attribute.