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rhettinger merged 1 commit into from
Feb 19, 2023
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gh-100425: Update tutorial docs related to sum() accuracy #101854

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2 changes: 1 addition & 1 deletion Doc/tutorial/stdlib2.rst
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Original file line numberDiff line numberDiff line change
Expand Up@@ -394,7 +394,7 @@ point::

>>> sum([Decimal('0.1')]*10) == Decimal('1.0')
True
>>> sum([0.1]*10) == 1.0
>>> 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 == 1.0
False
Comment on lines 397 to 398

@arhadthedevarhadthedevFeb 12, 2023

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Can confirm:

RunningRelease|x64interpreter...
Python3.12.0a5+ (heads/main:dfc2e065a2, Feb122023, 11:14:56) [MSCv.192964bit (AMD64)] onwin32Type"help", "copyright", "credits"or"license"formoreinformation.
>>>sum([0.1]*10) ==1.0True>>>0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1==1.0False

@rhettinger as an author of the referenced PR.


The :mod:`decimal` module provides arithmetic with as much precision as needed::
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