What’s new in Celery 4.0 (latentcall) — Celery 4.1.0 documentation

Preface¶ Welcome to Celery 4! This is a massive release with over two years of changes. Not only does it come with many new features, but it also fixes a massive list of bugs, so in many ways you could call it our “Snow Leopard” release. The next major version of Celery will support Python 3.5 only, where we are planning to take advantage of the new asyncio library. This release would not have bee

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これにしたい...“You can also define a __json__ method on your custom classes to support JSON serialization (must return a json compatible type):”