Josh Rosenberg added the comment: For the record, I have intentionally used bytes.maketrans to make translation table for str.translate for precisely this reason; it's much faster to look up a ordinal in a bytes object than in a dictionary. Before the recent (partial) patch for str.translate performance (#21118), this was a huge improvement if you only needed to worry about latin-1 characters (though encoding to latin-1, using bytes.translate, then decoding again was still faster). It's still faster than using a dictionary even with the patch from #21118, but it's not nearly as significant.
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