Large integers from C
Phil Mayers
p.mayers at ic.ac.uk
Wed Feb 20 11:30:39 EST 2002
All,
I need to create Large (>300 bit) python Long's from C. I don't need (and
in fact, don't want) to use the features of the (apparently obselete?)
mpz module, or gmpy, or whatever. I simply want to say:
val = PyLong_FromOctets(char *v, int vlen);
...where v is a MSB- or LSB-first octet string, base 256. This function
or an equivalent appears to be completely lacking from the Python C
interface.
I just know someone is going to say "return the octet string and do this:
intval = reduce(lambda x,y: (x<<8)+ord(y), strval)
I've tried, and this was too slow (the whole point of the C module being
to speed this up).
Any ideas?
Cheers,
Phil
More information about the Python-list
mailing list