Python promises (Python 3 version)

 A Python implementation of the promise pattern for asynchronous programming.
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 This is a special implementation of promises in that it can be used both for
 "promise of a value" and lazy evaluation. The biggest upside for this is that
 everything in a promise can also be a promise, e.g. filters, callbacks and
 errbacks can all be promises.
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 This package contains the Python 3 version of the library.