January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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decimal 模組
|
495
為
float
的有界精確度）。
Fraction
類別的實體會有特性
numerator
與
denominator
。
約分為最簡
Fraction
會將分數約為最低項，舉例來說，
f = Fraction(226, 452)
所建置的一個實體
f
等同於
Fraction(1, 2)
所建置的。原本傳入
Fraction
的分子與分
母無法從建置出的實體復原回來。
from fractions import Fraction
>>> Fraction(1,10)
Fraction(1, 10)
>>> Fraction(Decimal('0.1'))
Fraction(1, 10)
>>> Fraction('0.1')
Fraction(1, 10)
>>> Fraction('1/10')
Fraction(1, 10)
>>> Fraction(0.1)
Fraction(3602879701896397, 36028797018963968)
>>> Fraction(-1, 10)
Fraction(-1, 10)
>>> Fraction(-1,-10)
Fraction(1, 10)
Fraction
還提供數個方法，包括
limit_denominator
，它能讓你建立
一個
float
的有理數近似值（rational approximation），舉例來說，
Fraction(0.0999).limit_denominator(10)
會回傳
Fraction(1, 10)
。
Fraction
實體是不可變的，並可作為字典中的鍵值或集合的成員 ...
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