Great to hear you mention that. PyWren was one of our inspirations. Other inspirations are its successor NumPyWren [1], and gg [2].

We've looked at the code for PyWren and in our opinion it's not practically usable as-is, even if you wanted to target only Lambda. Also we initially focussed more on the deployment aspect (i.e. getting environment + code on the target machines reproducibly), and EC2 because we figured to make this general enough people would need an escape hatch anyway if Lambdas didn't cut it for some reason.

[1] https://github.com/Vaishaal/numpywren

[2] "From Laptop to Lambda: Outsourcing Everyday Jobs to Thousands of Transient Functional Containers" https://www.usenix.org/conference/atc19/presentation/fouladi