[Python-Dev] Octal literals (original) (raw)

James Y Knight foom at fuhm.net
Thu Feb 2 21:26:24 CET 2006

On Feb 2, 2006, at 7:11 PM, Bengt Richter wrote:

[1] To reduce all this eye-glazing discussion to a simple example, how do people now use hex notation to define an integer bit-mask constant with bits 31 and 2 set?

That's easy: 0x80000004

That was broken in python < 2.4, though, so there you need to do: MASK = 2**32 - 1 0x80000004 & MASK

(assume 32-bit int for target platform, counting bit 0 as LSB and bit 31 as sign).

The 31st bit isn't the sign bit in python and the bit-ness of the
target platform doesn't matter. Python's integers are arbitrarily
long. I'm not sure why you're trying to pretend as if python was C.

James

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