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==Python Decimal==
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==[[Python Decimal]]==
 
[[Python]] |  
 
[[Python]] |  
[[http://python.secsup.org/?p=138 Python Osmosis]] |
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[http://python.secsup.org/?p=138 Python Osmosis]
  
 
===Decimal===
 
===Decimal===
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     Personal firewall software may warn about the connection IDLE
 
     Personal firewall software may warn about the connection IDLE
 
     makes to its subprocess using this computer's internal loopback
 
     makes to its subprocess using this computer's internal loopback
     interface.  This connection is not visible on any external
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     interface.  This connection is not [[vi]]sible on any external
 
     interface and no data is sent to or received from the Internet.
 
     interface and no data is sent to or received from the Internet.
 
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2020年2月16日 (日) 04:31時点における最新版

Python Decimal

Python | Python Osmosis

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
Type "copyright", "credits" or "license()" for more information.

    ****************************************************************
    Personal firewall software may warn about the connection IDLE
    makes to its subprocess using this computer's internal loopback
    interface.  This connection is not visible on any external
    interface and no data is sent to or received from the Internet.
    ****************************************************************
    
>>> 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')