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(ページの作成:「==Python Decimal== [Python] [http://python.secsup.org/?p=138 Python Osmosis] ===Decimal=== *from decimal で利用 *小数点以下の計算も正しく行う *ge…」) |
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| 1行目: | 1行目: | ||
==Python Decimal== | ==Python Decimal== | ||
| − | [Python] | + | [[Python]] |
| − | [http://python.secsup.org/?p=138 Python Osmosis] | + | [[http://python.secsup.org/?p=138 Python Osmosis]] |
===Decimal=== | ===Decimal=== | ||
| 18行目: | 18行目: | ||
**************************************************************** | **************************************************************** | ||
| − | + | >>> from decimal import * | |
| − | + | >>> Decimal('0.70') * Decimal('1.05') | |
Decimal('0.7350') | Decimal('0.7350') | ||
| − | + | >>> .70 * 1.05 | |
0.73499999999999999 | 0.73499999999999999 | ||
| − | + | >>> Decimal('1.00') % Decimal('.10') | |
Decimal('0.00') | Decimal('0.00') | ||
| − | + | >>> 1.00 % 0.10 | |
0.09999999999999995 | 0.09999999999999995 | ||
| − | + | >>> sum([Decimal('0.1')] * 10) == Decimal('1.0') | |
True | True | ||
| − | + | >>> sum([0.1] * 10) == 1.0 | |
False | False | ||
| − | + | >>> getcontext().prec = 36 | |
| − | + | >>> Decimal(1) / Decimal(7) | |
Decimal('0.142857142857142857142857142857142857') | Decimal('0.142857142857142857142857142857142857') | ||
2020年2月15日 (土) 08:05時点における版
Python Decimal
Decimal
- from decimal で利用
- 小数点以下の計算も正しく行う
- getcontext().prec で有効桁数を設定
Python 2.6.3 (r263rc1:75186, Oct 2 2009, 20:40:30) [MSC v.1500 32 bit (Intel)] on win32
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>>> from decimal import *
>>> Decimal('0.70') * Decimal('1.05')
Decimal('0.7350')
>>> .70 * 1.05
0.73499999999999999
>>> Decimal('1.00') % Decimal('.10')
Decimal('0.00')
>>> 1.00 % 0.10
0.09999999999999995
>>> sum([Decimal('0.1')] * 10) == Decimal('1.0')
True
>>> sum([0.1] * 10) == 1.0
False
>>> getcontext().prec = 36
>>> Decimal(1) / Decimal(7)
Decimal('0.142857142857142857142857142857142857')
© 2006 矢木浩人
