Yes but it's super barebones. Its successor, Ryan Dahl's second attempt at JS runtime, Deno, has a much fuller standard library (inspired by Go).
I think that's a categorical "no", because Python isn't an objectively better language than JavaScript. I'm saying this as a Python developer since v1.5 (>20 years).
Subjective opinions are a different matter.
All of this is subjective, of course. WASM isn't going to make Python the language of choice for browsers any time soon.
[0]: https://insights.stackoverflow.com/survey/2021#section-most-...