python(5)future模块

本文介绍了如何在Python中使用精确除法,通过导入from __future__ import division来改变除法运算符的行为,使得整数除法也能得到浮点数结果。

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from future import division
导入python未来支持的语言特征division(精确除法),当我们没有在程序中导入该特征时,”/”操作符执行的是截断除法(Truncating Division),当我们导入精确除法之后,”/”执行的是精确除法,如下所示:

>>> from __future__ import division
>>> 3/4
0.75

如果使用这个语句,则该语句必须是模块或程序的第一个语句。此外,’_ future_’ 模块中存在的特性最终将成为Python语言标准的一部分。到那时,将不再需要使用 ‘future’ 模块。

Introduction to gettext Usually, programs are written and documented in English, and use English at execution time for interacting with users. This is true not only from within GNU, but also in a great deal of proprietary and free software. Using a common language is quite handy for communication between developers, maintainers and users from all countries. On the other hand, most people are less comfortable with English than with their own native language, and would rather be using their mother tongue for day to day's work, as far as possible. Many would simply love seeing their computer screen showing a lot less of English, and far more of their own language. GNU `gettext' is an important step for the GNU Translation Project, as it is an asset on which we may build many other steps. This package offers to programmers, translators, and even users, a well integrated set of tools and documentation. Specifically, the GNU `gettext' utilities are a set of tools that provides a framework to help other GNU packages produce multi-lingual messages. These tools include a set of conventions about how programs should be written to support message catalogs, a directory and file naming organization for the message catalogs themselves, a runtime library supporting the retrieval of translated messages, and a few stand-alone programs to massage in various ways the sets of translatable strings, or already translated strings. A special GNU Emacs mode also helps interested parties in preparing these sets, or bringing them up to date.
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