integer to binary...

[Grant Edwards]

Um...let's not use bad logic/proofs for evidencing this...

True

Sets aren't numbers. Perhaps I should have phrased it better:
xor is only defined for numbers if they are represented in
binary. If numbers were represented in something other than
binary, then an xor operation on those numbers wouldn't make
sense.

 

[Bruno Desthuilliers]

Grant Edwards a écrit :

Yes, really.

No, not really.

Otherwise the bitwise boolean operations you
demonstrated wouldn't work as shown.

Ho yes ?

(7).__class__

dir((7))

['__abs__', '__add__', '__and__', '__class__', '__cmp__', '__coerce__',
'__delattr__', '__div__', '__divmod__', '__doc__', '__float__',
'__floordiv__', '__getattribute__', '__getnewargs__', '__hash__',
'__hex__', '__init__', '__int__', '__invert__', '__long__',
'__lshift__', '__mod__', '__mul__', '__neg__', '__new__', '__nonzero__',
'__oct__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__',
'__rdiv__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__',
'__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__',
'__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__',
'__rxor__', '__setattr__', '__str__', '__sub__', '__truediv__', '__xor__']

The fact that they impliment the xor operator is pretty much
proof that integers are

.... objects, instance of the int class. Not really what I'd call "binary
format" !-)

Now if you go that way, it's of course true that everything on a
computer ends up in a binary format.... It's true.

stored in binary format -- xor is only
defined for binary numbers.

class Prisonner(object):
def __xor__(self, other):
return "I'm not a (binary) number, I'm a free man"

The fact that an object implements the xor operator is pretty much proof
that the guy that wrote the class decided to implement the xor operator !-)

Grant, I of course agree that, *for practical means*, one can consider
that Python's integer are "already in binary format" - for a definition
of "binary format" being "you can do bitwise ops on them". But the truth
is that Python integers are objects (in the OO meaning) holding integer
values - not integer values themselves.