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gh-100425: Update tutorial docs related to sum() accuracy #101854

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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 number Diff line number Diff line change
@@ -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
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Can confirm:

Running Release|x64 interpreter...
Python 3.12.0a5+ (heads/main:dfc2e065a2, Feb 12 2023, 11:14:56) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> sum([0.1]*10) == 1.0
True
>>> 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 == 1.0
False

@rhettinger as an author of the referenced PR.


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