[Python-Dev] What's a PyStructSequence ?
M.-A. Lemburg
mal@lemburg.com
2001年11月28日 10:15:53 +0100
Mark Hammond wrote:
>> > Py_True, of course, *is* 1. There is no proper boolean type.
>> Seeing you added emphasis on the *is*, I assume you meant *is* :)
>> >>> true=(1==1)
> >>> true is 1
> 0
> >>>
>> Py_True == 1, but is *not* 1
Py_True is a singleton and all 1 integers in Python are cached
and shared, so we end up having exactly two different objects
for the number 1 in Python: Py_True and 1 (or 3-2 or 4/4 or ...).
--
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
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