feat(python): Add top-level nth(n)
method, to go with existing first
and last
#16112
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Had a local use-case that would have benefited from this and realised we hadn't exposed the existing
Expr::nth
(as used byfirst
&last
) up to the Python API. Allows for selection of the "nth" col or value, depending on context. Also slightly clarified the existing first/last docstrings.Example