[Twisted-Python] Code question - semantic meaning of IServiceCollection(parent, parent)

[Jonas Brunsgaard]

Hello all

Will someone explain to me what happens when you call an Interface
with arguments, and why the same argument twice?

My problem is to understand the semantics of the line

    parent = IServiceCollection(parent, parent)

part of

    def setServiceParent(self, parent):
        if self.parent is not None:
            self.disownServiceParent()
        parent = IServiceCollection(parent, parent)
        self.parent = parent
        self.parent.addService(self)

in twisted.application.service

Thanks in advance.

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