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<H1>[pycrypto] Python 3.x vs. Python 2.1 - stay of execution</H1>
<B>Thorsten Behrens</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=%5Bpycrypto%5D%20Python%203.x%20vs.%20Python%202.1%20-%20stay%20of%20execution&In-Reply-To=4D1972A2.4080305%40gmx.li"
TITLE="[pycrypto] Python 3.x vs. Python 2.1 - stay of execution">sbehrens at gmx.li
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<I>Mon Dec 27 23:39:59 CST 2010</I>
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<PRE>Writing this stuff out helps me think about it. I have a solution. When,
or if, the 3.x port is successful, the fate of 2.1 can be decided.
For now, I have created two files: Util/py21floordiv.py and
Util/floordiv.py. In Util/number.py, I then include based on version:
if sys.version[0:3] == "2.1":
from Crypto.Util.py21floordiv import *
else:
from Crypto.Util.floordiv import *
The offending code snippet
if GCD (e, (X-1)/2) != 1:
becomes
if GCD (e, floordiv((X-1),2)) != 1:
This works on Python 2.1, 2.7 and 3.1
Thorsten
On 12/28/2010 12:16 AM, Thorsten Behrens wrote:
><i> I've run into a bit of a snag. The / operator in 2.x returns an int, and
</I>><i> in 3.x it can return a float. This causes an infinite loop in
</I>><i> numbers.py. I can solve it with //, which is supported from 2.2 on, but
</I>><i> not in 2.1.
</I>
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