renumerate 1.0.9

雷诺数

反向枚举。

概述

renumerate（序列，开始=长度（序列）-1，结束=0）：

Return an enumerate object.

sequence must be an object that has a __reversed__() method or supports the

sequence protocol (the __len__() method and the __getitem__() method with

integer arguments starting at 0).

The __next__() method of the iterator returned by renumerate() returns a tuple

containing a count (from start which defaults to len(sequence) - 1 or ends at

end which defaults to 0 - but not both) and the values obtained from reverse

iterating over sequence.

>>>fromrenumerateimportrenumerate>>>seasons=['Spring','Summer','Fall','Winter']>>>list(renumerate(seasons))[(3,'Winter'),(2,'Fall'),(1,'Summer'),(0,'Spring')]>>>list(renumerate(seasons,start=4))[(4,'Winter'),(3,'Fall'),(2,'Summer'),(1,'Spring')]>>>list(renumerate(seasons,end=2))[(5,'Winter'),(4,'Fall'),(3,'Summer'),(2,'Spring')]

相当于：

defrenumerate(sequence,start=None,end=None):ifstartisnotNoneandendisnotNone:raiseTypeError("renumerate() only accepts start argument or end argument"" - not both.")ifstartisNone:start=len(sequence)-1ifendisNone:end=0n=start+endforeleminreversed(sequence):yieldn,elemn-=1

安装

先决条件：

• python 2.7或python 3.4或更高版本
  • http://www.python.org/
  • 2.7和3.7是主要的测试环境。
• pip和setuptools
  • http://pypi.org/project/pip/
  • http://pypi.org/project/setuptools/

要安装，请运行：

python -m pip install --upgrade renumerate

开发

访问development page

从源安装：

克隆sources并运行：

python -m pip install ./renumerate

或开发模式：

python -m pip install --editable ./renumerate

先决条件：

• 开发严格基于tox。要安装它，请运行：

  python -m pip install tox
  

许可证

Copyright (c) 2016-2019 Adam Karpierz

Licensed under the zlib/libpng License

http://opensource.org/licenses/zlib/

Please refer to the accompanying LICENSE file.

作者

• 亚当·卡尔皮耶兹，adam@karpierz.net>；

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