python inheritance：__init__（自我，自我）？

Question

I see a piece of code that is

class IBapi(EWrapper, EClient):
    def __init__(self):
        EClient.__init__(self, self)

I'm confused what the self, self does. I'm used to something like this.

class TestClient(EClient):
    def __init__(self, wrapper):
        EClient.__init__(self, wrapper)

Can someone explain self, self ?

Answer 1

self is an object of the class "IBapi" and also an instance of the classes "EWrapper" and "EClient" through inheritance. I am guessing that the constructor of "EClient" gets an instance of "EWrapper" as a parameter. You can think of your code like this:

class IBapi(EWrapper, EClient):
  def __init__(self):
    wrapper = self
    EClient.__init__(self, wrapper)