[Twisted-Python] Really Basic clarification on defers

[Jarrod Roberson]

Deferreds don't do what you think they do.
They don't do anything to make your code non-blocking.
They only adhere to a contract that something will eventually be returned.
The most common use of deferred's to make your code non-blocking is to use
.deferToThread()
or some other mechanism to make the long running code non-blocking, like
spawning a process.
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