Hi,

the following statement yields different results in python2 and python3:
284397269195572115652769428988866694680//17 - int(284397269195572115652769428988866694680/17)

In python3 it yields:
309657313492949847071

In python2 it yields:
OL

Python2's result seems to be correct as (284397269195572115652769428988866694680//17) and (int(284397269195572115652769428988866694680/17)) should return the same result (as far as I understand).

With smaller numbers, this difference in results does not appear with python3.

Note: I noticed this, while working on RSA; 284397269195572115652769428988866694680 is (p-1)(q-1) and 17 is e. I just mention this in case it could help.

I used linux version 3.3.3.0 and 2.7.3 for the tests on a 64 bits processor.

Sorry if I am missing something here.

In Python 3 "/" gives float division, whereas in Python 2 it is integer division, the same as "//".

Just to clarify, if you use float division then you get rounding errors.  309657313492949847071 is a rounding error:

>>> x = 284397269195572115652769428988866694680//17
>>> x - int(float(x))
309657313492949847071L

Does your comment mean that this is bug should be closed as notabug since anyone wanting to avoid such rounding error should use // operator?

Yes.