Question

<代码>fractions模块,如<编码>cFractions模块,如有<代码>cDecimal模块,该模块与<代码>Decimal模块更为对应? <代码>fractions 模块过于缓慢。

Answer 1

我也在努力解决缺乏这一一揽子方案的问题,并决定执行一个叫cfractions。 (来源代码on Github 。

我们唯一需要的是安装这一设备。

/path/to/python3 -m pip install cfractions

之后,将<代码>fractions改为cfractions列入你的模块,这样容易。

主要特征

减去记忆

>>> from cfractions import Fraction
>>> import sys
>>> sys.getsizeof(Fraction())
32

比较

>>> from fractions import Fraction
>>> import sys
>>> sys.getsizeof(Fraction())
48

因此,它基本上属于一个平原<条形码>,目标+<2>点,用于计算器和复制;删除。

速度越快:

construction from pair of int

construction from single float

construction from str

sum of n instances

product of n instances or if we take a look at relative performance we can see fractions.Fraction skyrocketing, yay!

perfplot Pack。 Python3.9.4。

支助

露天焚烧

参照数字/登革热计算,单一<代码>intfloat /any numbers.Rational Value,str(从换算代码>1.4.0 <<<<<<>>>>><<>>>>>>>

算术和抽样;比较作业

(_repr__ &__str_)

。

2. 易变性与安放;

以<代码>int和float(通过转换Fraction>>/code>为后一种编码>float,因为编号为fractions。 Fraction

<代码>PyPy支持(改为fractions)。 Fraction proxy

https://github.com/HypothesisWorks/hypothesis”rel=“nofollow noretinger”>Hypothesis。

What it doesn t include

operating with complex.

Answer 2

http://code.google.com/p/gmpy/“rel=“nofollow”http://code.google.com/p/gmpy/

它利用GMP mutliple-precision图书馆进行快速编造和理算。

注:Im也是维护者。

Answer 3

不幸的是,在不需要经过汇编的外部依赖的情况下,没有类似的条件。根据你们的需要,我做了以下工作:。可能提供帮助。

它暴露了以下功能:opFrac(num),即选择性地将某一吨、浮标或Fraction转换为具有排位限制的浮标或Fraction(因为我使用65535号,因为Im与小分数做生意);如果该浮标能够确切地在双位(即它拥有两个排位数的多种力量),则只剩下。否则,它就将它变为“框架”。同样,如果《框架》在双程中确实具有代表性,那么我们就把它变成了浮标;否则,我们就离开了。

The actionFr(float).limit_denominator(x) calls is derived out into a helper function, _preFracLimitDenominator, that only establishs one Fr> Object, but not the three average established with the calls.

The use cases for this gist are pretty few, but where they exist, the results are spectacular. For my project, music21, we work mostly with notes that are generally placed on a beat (integer) or on a half, quarter, eighth, etc. beat (exactly representable in binary), but on the rarer occasions when notes have placement (offset) or duration that is, say, 1/3 or 1/5 of a beat, we were running into big floating point conversion problems that led to obscure bugs. Our test suite was running in 350 seconds using floating point offsets and durations. Switching everything to Fractions ballooned the time to 1100 seconds -- totally unacceptable. Switching to optional Fractions with fast Fraction creation brought the time back to 360 seconds, or only a 3% performance hit.

如果你有时能够处理浮标问题,有时甚至处理不成体系问题,那可能是前进的道路。

Answer 4

I couldn t find anything. You could make one.http://docs.python.org/extending/extending.html

http://www.spiration.co.uk 利用2个员额,还处理负数。

But that may not be what you need and you can find something else. If you don t want to extend python you have to stick to Fractions if you can t find anyone who has a cFractions module. I m sorry.

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