Toolz 是 Python 的函数式编程工具箱。Toolz 支持 python 2.6+ 和 Python 3.3+。
Toolz 的实现包括三部分：
itertoolz，for Operations on iterables. 例如：groupby,uNique, interpose,
Functoolz, for higher-oRDEr functions. 例如：memoize,curry, compose
dicttoolz, for opeRATions on dictionarIEs. 例如：assoc,upDate-in, merge.
示例：
>>> def stem(word):
... """ Stem word to primitive form """
... return word.lower().rstrip(",.!:;'-\"").lstrip("'\"")
>>> from toolz import compose, frequencies, partial
>>> wordcount = compose(frequencies, partial(map, stem), str.split)
>>> sentence = "This cat jumped over this other cat!"
>>> wordcount(sentence)
{'this': 2, 'cat': 2, 'jumped': 1, 'over': 1, 'other': 1}