[Pyrex] Question about +=, -=, *=, etc.

[Fernando Perez]

Phillip J. Eby wrote:

> Try this as a simple workaround:
> 
>      cdef extern from "Python.h":
>          object PyNumber_InPlaceAdd(object o1, object o2)
> 
>      for i in long_list:
>          my_array = PyNumber_InPlaceAdd(my_array,some_function(i))
> 
> This is effectively the code that a += operator would generate.
> 
> In general, if you're looking to improve Python performance via Pyrex, it's 
> important to know what functions are available in the Python/C API, as 
> calling these functions directly can, under the right circumstances, yield 
> further performance boosts over "naive" Pyrex code.

Many thanks!  I'm a complete pyrex newbie, so I didn't realize that Py/C API 
calls could be made directly from within pyrex code.  This is actually great 
to know, since I think it will allow me to cut through the dynamic typing 
overhead in the critical loops of my code.

Best,

Fernando