I already did that and I get this:
cdef list codeSet = []
__pyx_1 = PyList_New(0); if (unlikely(!__pyx_1)) {__pyx_filename =
__pyx_f[0]; __pyx_lineno = 210; __pyx_clineno = __LINE__; goto
__pyx_L1_error;}
__pyx_v_codeSet = __pyx_1;
__pyx_1 = 0;
and if I don't do it that way I get:
addVector = []
__pyx_2 = PyList_New(0); if (unlikely(!__pyx_2))
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 215; __pyx_clineno =
__LINE__; goto __pyx_L1_error;}
Py_DECREF(__pyx_v_addVector);
__pyx_v_addVector = ((PyObject *)__pyx_2);
__pyx_2 = 0;
On Sep 26, 2:55 am, Robert Bradshaw <[EMAIL PROTECTED]>
wrote:
> On Sep 26, 2008, at 12:09 AM, Simon King wrote:
>
>
>
>
>
> > On Sep 25, 6:45 pm, cesarnda <[EMAIL PROTECTED]> wrote:
> > ...
> >> result = []
> > ...
> >> result.append(n)
>
> > ...
> >> if I compile in the notebook I get a html file showing me the
> >> following lines in yellow:
>
> >> def primes(int kmax):
> >> result = []
> >> result.append(n)
> >> return result
>
> >> how can I modify this example to avoid the yellow lines?
>
> > As other people pointed out, there is not much hope for the "def" and
> > the "return" line.
>
> > But wouldn't it be possible to do
> > cdef list result = []
>
> Yep, you could do this. The resulting C code calls PyList_New(0)
> which is the fastest way to make a list.
>
> > And isn't there a quick, dirty and potentially unsafe way of appending
> > to a list?
>
> Since it knows result is a list (due to the cdef above), it uses
> PyList_Append, the fastest way to append to a list.
>
> > Or at least for assigning a value to some list entry? I
> > think I have seen it somewhere, but I don't remember the name.
>
> Yep. Currently it calls __Pyx_SetItemInt which does an inline runtime
> boundscheck and check for a list, and if it's OK uses a macro to
> reset the specified entry right there. We could (should) optimize
> this in the case it already knows it's a list, but with good branch
> prediction it's probably within 5% of as fast as it could be period.
>
> - Robert
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