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Finally Zappa(https://github.com/Miserlou/Zappa) would be able to support web services written in python 3!

Yep!

Follow the progress here: https://github.com/Miserlou/Zappa/issues/793

I much prefer Chalice (https://github.com/awslabs/chalice) which just got a synchronized release supporting Python 3 as well.

Have you tried both? Can you explain what you prefer in Chalice over Zappa?

Yes. In my impression Chalice is designed to be a microframework (emphasis on micro) with the bare minimum of glue necessary to make deploying Lambda apps easy. Zappa is designed around an ill-fitting API (while WSGI is widespread, it's clunky and a layering violation of sorts when put in the Lambda runtime environment) and has a development philosophy that I don't agree with.

I wrote up a comparison of the two here: https://blog.zappa.io/posts/comparison-zappa-verus-chalice

Zappa has even more features now. Basically, you can't even build real server-less apps with Chalice, plus Zappa has support for tons of other magic features.

I stopped using Chalice in favor of Zappa because Zappa made it trivial to run a local dev environment (it's just Flask/Django/WSGI). Have I missed something about this with Chalice?

Chalice does provide a local mode, yes. It worked well for me.

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