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Ok, so I take from this that the post about specifically Python 3.7 doesn't make much sense really (as a HN post).

It makes sense because this is an AWS supplied executable, where you just upload the .py files.

If you follow the "Run any language" approach, you need to bundle the python interpreter and any libraries required.

AWS provides the Python 3.7 runtime for you, so you don't need to bundle it. The post refers to runtimes that AWS doesn't provide, such as Haskell.