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specific types of events, which may specify alternate interfaces for the given event function, or provide
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instructions regarding secondary event targets based on the given target.
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a class bound specification method, which exists bound to a marker class that's described in the documentation.
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For example, the documentation for :meth:`.PoolEvents.connect` indicates that the event name is ``"connect"``
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and that a user-defined listener function should receive two positional arguments::