Itertools groupby do nothing but keyfunction sort correct

@flokart wrote:

Hi all,

I tried to use the Itertools.groupby but unfortunatly the result is only a flat list and no sublists with the same X value.

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I tried the also pt.Y and pt.X and pt.Y and for sorted it works thanks to helpful forum members…but i have no idea why groupby do nothing.

Thanks

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