Re: 2 + 2 = 5

[Laszlo Nagy]

On 2012-07-04 21:37, Paul Rubin wrote:

I just came across this (https://gist.github.com/1208215):

     import sys
     import ctypes
     pyint_p = ctypes.POINTER(ctypes.c_byte*sys.getsizeof(5))
     five = ctypes.cast(id(5), pyint_p)
     print(2 + 2 == 5) # False
     five.contents[five.contents[:].index(5)] = 4
     print(2 + 2 == 5) # True (must be sufficiently large values of 2 there...)

Heh.  The author is apparently anonymous, I guess for good reason.

>>> five.contents[five.contents[:].index(5)] = 4
>>> 5
4
>>> 5 is 4
True

But this I don't understand:

>>> 5+0
4
>>> 5+1
4
>>> 5+2
6


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