[ python-Bugs-1544381 ] Bad result of calculation

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Bugs item #1544381, was opened at 2006-08-22 07:15
Message generated for change (Comment added) made by gbrandl
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Category: Performance
Group: Python 2.4
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Jean-Christophe BERTOLINI (jbertoli)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bad result of calculation

Initial Comment:
In the Python Shell enter:
>>> 3.84-4.5
-0.66000000000000014

The last digits of the calculation result are wrong


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>Comment By: Georg Brandl (gbrandl)
Date: 2006-08-22 08:20

Message:
Logged In: YES 
user_id=849994

This is due to how floats work. See
http://www.python.org/doc/faq/general/#why-are-floating-point-calculations-so-inaccurate
.

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