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Wed Jun 23 06:15:33 EDT 2004 · https://mail.python.org/pipermail/python-dev/2004-June/045520.html

Hello Guido,

On Tue, Jun 22, 2004 at 10:49:51PM -0700, Guido van Rossum wrote:
> (For other operations, I still want to see e.g. long+float to return a
> float rather than a long -- you *have* to do it this way for obvious
> reasons when the values are relatively small, e.g. consider 1 + 0.5.)

Well, just for quick consideration (and probably rejection :-) :

If "a <= b" is to mean we convert a and b to either float or long depending on
their magnitude, would it make any sense at all if other operators like "a +
b" would do the same, to maximize precision?

>>> 1L + 0.5
1.5
>>> L = 100000000000000000000000L
>>> float(L)
9.9999999999999992e+22
>>> float(L+1)
9.9999999999999992e+22
>>> L + 1.0
9.9999999999999992e+22      # currently
100000000000000000000001L   # suggested

Armin

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[Python-Dev] Comparing heterogeneous types