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I am trying to subclass str object, and add couple of methods to it. My main purpose is to learn how to do it. Where I am stuck is, am I supposed to subclass string in a metaclass, and create my class with that meta, or subclass str directly? And also, I guess I need to implement __new__() somehow, because, my custom methods will modify my string object, and will return new mystr obj. My class's methods, should be completely chainable with str methods, and should always return a new my class instance when custom methods modified it. I want to be able to do something like this: a = mystr("something") b = a.lower().mycustommethod().myothercustommethod().capitalize() issubclass(b,mystr) # True I want to have it all the abilities that a str have. For example, a = mystr("something") then I want to use it like, a.capitalize().mycustommethod().lower() It is my understanding that, I need to implement __new__() . I think so because, strings methods would probably try to create new str instances. So , if I overwrite __new__() , They supposedly would return my custom str class. However, I don't know how to pass arguments to my custom class's __init__() method in that case. And I guess I would need to use type() in order to create a new instance in __new__() method right?

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