Записки программиста, обо всем и ни о чем. Но, наверное, больше профессионального.

2013-10-22

toolz

Why is it that we rejoice at a birth and grieve at a
funeral? It is because we are not the person involved.
Pudd'nhead Wilson's Calendar

Интересный пакет для разработки на Python: PyToolz.

The Toolz project provides a set of utility functions for iterators, functions, and dictionaries. These functions are designed to interoperate well, forming the building blocks of common data analytic operations. They extend the standard libraries itertools and functools and borrow heavily from the standard libraries of contemporary functional languages.

Toolz provides a suite of functions which have the following virtues:

Composable: They interoperate due to their use of core data structures.
Pure: They don’t change their inputs or rely on external state.
Lazy: They don’t run until absolutely necessary, allowing them to support large streaming data sets.

This gives developers the power to write powerful programs to solve complex problems with relatively simple code which is easy to understand without sacrificing performance. Toolz enables this approach, commonly associated with functional programming, within a natural Pythonic style suitable for most developers.


Библиотека дает питонистам инструменты, которыми гордятся пишущие на функциональных языках

While Python was originally intended as an imperative language [Guido], it contains all elements necessary to support a rich set of features from the functional paradigm. In particular its core data structures, lazy iterators, and functions as first class objects can be combined to implement a common standard library of functions shared among many functional languages.

This was first recognized and supported through the standard libraries itertools and functools which contain functions like permutations, chain and partial to complement the standard map, filter, reduce already found in the core language. While these libraries contain substantial functionality they do not achieve the same level of adoption found in similar projects in other languages. This may be because they are incomplete and lack a number of commonly related functions like compose and groupby which often complement these core operations.

A completion of this set of functions was first attempted in the projects itertoolz and functoolz (note the z). These libraries contained several functions that were absent in the standard itertools/functools libraries. The itertoolz/functoolz libraries were eventually merged into the monolithic toolz project described here.

Most contemporary functional languages (Haskell, Scala, Clojure, ...) contain some variation of the functions found in toolz. The toolz project generally adheres closely to the API found in the Clojure standard library



Рекомендовано всем, кому не хватает функциональности в императивности.

original post http://vasnake.blogspot.com/2013/10/toolz.html

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