[Python-Dev] Providing support files to assist 3.x extension authors

Stefan Behnel stefan_ml at behnel.de
Sun Jan 3 09:11:16 CET 2010

Case Vanhorsen, 20.12.2009 01:38:
> When I ported gmpy (Python to GMP multiple precision library) to
> Python 3.x, I began to use PyLong_AsLongAndOverflow frequently. I
> found the code to slightly faster and cleaner than using PyLong_AsLong
> and checking for overflow.

You might want to look at the code Cython generates for integer type 
conversions. We use specialised coercion code that gets generated 
on-the-fly to convert Python long/int from and to all sorts of C integer 
types with compile time (portability) and runtime size/value checks. 
Depending on your needs, this may or may not be faster than the above C-API 


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