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Sun Oct 1 19:54:31 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-October/069109.html

"Nick Craig-Wood" <nick at craig-wood.com> wrote in message 
news:20061001093846.GA20938 at craig-wood.com...
> On Fri, Sep 29, 2006 at 12:03:03PM -0700, Guido van Rossum wrote:
>> I see some confusion in this thread.
>>
>> If a *LITERAL* 0.0 (or any other float literal) is used, you only get
>> one object, no matter how many times it is used.
>
> For some reason that doesn't happen in the interpreter which has been
> confusing the issue slightly...
>
> $ python2.5
>>>> a=0.0
>>>> b=0.0
>>>> id(a), id(b)
> (134737756, 134737772)

Guido said *a* literal (emphasis shifted), reused as in a loop or function 
recalled, while you used *a* literal, then *another* literal, without 
reuse.  Try a=b=0.0 instead.

Terry Jan Reedy

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[Python-Dev] Caching float(0.0)