Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

1. Task._fut_waiter is a private API, please avoid it
2. Task class is derived from Future, thus it HAS add_done_callback() method. 
The other question is that from my experience if the application-level code 
uses add_done_callback() the design is not perfect and error-prone. 
add_done_callback() is useful for relatively low-level libraries.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37281>
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