Bugs item #1729014, was opened at 2007-05-31 15:27
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Johnnyg (swfiua)
Assigned to: Nobody/Anonymous (nobody)
Summary: 0.0 and -0.0 end up referring to the same object
Initial Comment:
I am not really sure whether this is a bug or a feature.
The attached code attempts to demonstrate the problem.
I had some code that was trying to change -0.0 to 0.0 so that the accountants I
work with don't panic.
The code was something like this:
if n == -0.0:
n = 0.0
Regardless of whether n is -0.0 or 0.0 the test passes (which is good).
However after the assignment n is actually -0.0
It looks like python is creating a single object for both -0.0 and 0.0.
Whichever appears first within the local scope seems to be the value that
actually gets stored.
Eg changing the code to
if n == 0.0:
n = 0.0
gets me the behaviour I wanted.
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