[Python-bugs-list] [ python-Bugs-501288 ] problems with divising
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noreply@sourceforge.net
Wed, 09 Jan 2002 10:40:09 -0800
Bugs item #501288, was opened at 2002-01-09 05:28
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Category: Python Interpreter Core
>Group: Not a Bug
>Status: Deleted
>Resolution: Invalid
Priority: 5
Submitted By: Zsolt Cserna (csernazs)
>Assigned to: Tim Peters (tim_one)
Summary: problems with divising
Initial Comment:
I have problems with divising (int/float) in python
2.1.1. For example, if I try divide two numbers
(45/100.0), the result of this will be not correct.
>>> 45/100.0
0.45000000000000001
Python 2.1.1+ (#1, Jan 8 2002, 00:37:12)
[GCC 2.95.4 20011006 (Debian prerelease)] on linux2
With python 1.5 it works correctly.
Thanks for help.
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Comment By: Tim Peters (tim_one)
Date: 2002-01-09 10:40
Message:
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user_id=31435
This is not a bug.
Binary floating point cannot represent decimal fractions exactly,
so some rounding always occurs (even in Python 1.5.2).
What changed is that Python 2.0 shows more precision than before
in certain circumstances (repr() and the interactive prompt).
You can use str() or print to get the old, rounded output:
>>> print 0.1+0.1
0.2
>>>
Follow the link for more information:
http://python.sourceforge.net/devel-docs/tut/node14.html
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