PERF: Styler

[jbrockmendel]

from asv_bench.benchmarks.io.style import *
self = Render()
self.setup(36, 12)

%timeit self.setup(36, 12); self.time_apply_render(36, 12)
29.2 ms ± 1.2 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)  # <- master
9.98 ms ± 706 µs per loop (mean ± std. dev. of 7 runs, 1 loop each)  # <- PR

cc @attack68

[attack68]

nice. good spot. lgtm. tests seem unrelated. there might be one or two other places this pattern might be better too.

[attack68]

Suggested change

	ser = attrs[cn]
	j = self.columns.get_loc(cn)
	ser = attrs[cn]

(remove repeated j lookup below)

[jbrockmendel]

can actually go further and just do for j, cn in enumerate(attrs.columns):, but will ask you to do that in #43287

[attack68]

can't becuase of subset, we are cross matching objects:
i.e.

self.columns ~ ["a", "b", "c", "d"]
attrs.columns ~ ["b", "d"]
=> j ~ [1, 3]  # not enumerate

[jreback]

thanks @jbrockmendel