gmpy and counting None

Robert Kern robert.kern at
Tue Oct 14 00:16:57 CEST 2008

Mensanator wrote:
> On Oct 13, 2:43 pm, <mma... at> wrote:
>> Hi,
>> I just stumbled upon the following issue (I am running Debian):
>> $ python
>> Python 2.5.2 (r252:60911, Sep 29 2008, 21:15:13)
>> [GCC 4.3.2] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.>>> [2, None].count(None)
>> 1
>>>>> from gmpy import mpz
>>>>> [mpz(2), None].count(None)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> TypeError: coercion to gmpy.mpz type failed
>> Is this a bug in gmpy?
> Does the underlying GMP code support Nulls?

I don't think it has to. Probably, it just should implement __ne__ to return 
False if it cannot coerce. Of course, the codebase is relatively old, so it may 
still be using __cmp__ and __coerce__. That would make things more difficult.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

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