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Comment by orlp | Hacker News Reader

    from polars import col as C

    df.select(C.x, y = C.w / C.z)

This is the way. Favor keyword arguments to alias.

Still, it’s a very good approximation but still an approximation to the more ergonomic and expressive tidyverse syntax

One person's "ergonomic and expressive" is another person's "wait what in the world is actually going on here".