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Re:Boltons: A set of BSD-licensed, pure-Python utilities by merlincorey on Tuesday October 09, 2018 @07:49PM (#18180795)
It uses `itertools` internally very heavily, which means if you generally are using generators and such, you maintain those benefits, as well as get to work with infinite sequences, etc.

If you do find a `toolz` function to be too slow, there's always the `cytoolz` versions.

Re:Boltons: A set of BSD-licensed, pure-Python utilities by stochastic_monk on Tuesday October 09, 2018 @11:24PM (#18181724)
cytoolz’s frequencies was around 10x as fast as using a vanilla dict and counting elements manually, which was in turn twice as fast as collections.Counter when I measured them a few years ago.

It’s solid work.

Re:Boltons: A set of BSD-licensed, pure-Python utilities by webmaven on Wednesday October 10, 2018 @12:04PM (#18186183)
How does cytoolz performance compare with toolz under PyPy?