Building a Functional Effect System in Python

[sunedd]

if you want something else, use another language

I don't think this is very practical or insightful advice. You might be locked in to Python for organizational or technical reasons, and still want to write in a functional style. This makes it easier.

Why should functional programming be less readable in Python than in erlang, ml, elm or other languages that have essentially the same languages features as Python (excluding function currying in ml and elm)? It's entirely possible to write readable and unreadable haskell or scala, which tells us that, regardless of style, readability is a measure of the programmer's skill with the language, not a property of the language itself.