[Python-Dev] Deprecation warning on integer shifts and such
Mon, 12 Aug 2002 17:50:57 +0200
Guido van Rossum wrote:
>>Guido van Rossum <firstname.lastname@example.org> writes:
>>>There's no excuse for that any more. The 'i' and 'l' format chars of
>>>PyArg_Parse* and PyInt_AsLong() both work for longs as well as for
>>There is a change, of course: Passing 0xff<<24 to a function that uses
>>the "i" converter will produce an OverflowError, whereas it previously
>>would pass in the negative numbers.
> And unfortunately the same will happen for the "l" converter
> (PyInt_AsLong(<long>) does a signed range check.
>>For cases of "I want 32 bits in an int", you'll have to accept both
>>signed and unsigned 32 bits - something that is currently not
>>supported in ParseTuple.
> Oops. Darn. You're right. Sigh. That's painful. We have to add a
> new format code (or more) to accept signed 32-bit ints but also longs
> in range(32).
Rather than inventing something new to be compatible to the existing
old status quo, I'd rather like to see new format codes for unsigned
integers and/or longs and have the existing ones support the new
> This should be added in 2.3 so extensions can start
> using it now, and user code can start passing longs in range(2**32)
> now. I propose 'k' (for masK). We should backport this to 2.2.2 as
> well. Plus a variant on PyInt_AsLong() with the same semantics, maybe
> named PyInt_AsMask().
> Any takers?
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