[Python-ideas] New explicit methods to trim strings

[David Mertz]

On Mon, Apr 1, 2019 at 10:11 PM Dan Sommers <
2QdxY4RzWzUUiLuE at potatochowder.com> wrote:

> So I've seen someone (likely David Mertz?) ask for something
> like filename.strip_suffix(('.png', '.jpg')).  What is the
> context?  Is it strictly a filename processing program?  Do
> you subsequently have to determine the suffix(es) at hand?
>

Yes, I've sometimes wanted something like "the basename of all the graphic
files in that directory."  But here's another example that is from my
actually current job:

I do machine-learning/data science for a living. As part of that, I
generate a bunch of models that try to make predictions from the same
dataset.  So I name those models like:

dataset1.KNN_distance_n10.gz
dataset1.KNN_distance_n10_poly2_scaled.xz
dataset2.KNN_manhattan_n6.zip
dataset2.KNN_distance_n10_poly2_scaled.xz
dataset1.KNN_minkowski_n5.gz
dataset1.LinSVC_Poly3_Scaled.gz
dataset2.LogReg.bz2
dataset2.LogReg_Poly.gz
dataset1.NuSVC_poly2_scaled.gz


I would like to answer the question "What types of models have I tried
against the datasets?"  Obviously, I *can* answer this question.  But it
would be pleasant to answer it like this:

styles = {model.lstrip(('dataset1', 'dataset2'))
               .rstrip(('gz', 'xz', 'zip', 'bz2))

          for model in models}


That's something very close to code I actually have in production now.

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