For me, its the explicitness in Python that is killer. I can see a name and match that to an import and match that to a package. Grabbing a function pointer works exactly as I would expect.
Stealing from Krister Stendahl's laws for religious discourse, Ruby's composable iteration is one area I have holy envy, particularly after I got used to it in Rust. I've used Python's generators many times just to have to switch to an explicit for loop. Things are generally better with a composable iteration model but occasionally I find myself switching to loops in Rust.
Unlike Ruby, Rust does pull-iteration, like Python, though there are experiments with Ruby-style push-iteration  .
Python driven environment for Live Coding
Not sure how they compare feature-wise, but take a look at FoxDot:
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