[Cython] Cannot coerce list to type 'list'

[Robert Bradshaw]

On Dec 17, 2008, at 3:54 PM, Muhammad Alkarouri wrote:

> Hi everyone,
>
> I have code that used to work in Cython 0.9.8.1.1 but doesn't work in
> the current version (0.10.3).
>
> I would like to know if this is a bug or is it something wrong in my
> code, and how to correct it either way. Can you please help me? The
> code and error are:
>
> from c_numpy cimport import_array, ndarray
> from c_python cimport list
> ...
> cdef class Scope:
>     """A multidimensional interval"""
>     cdef readonly ndarray centre
>     cdef Scope parent
>     cdef int height
>     cdef list refinements
>     def __init__(self, ndarray centre, Scope parent, int height):
>         self.centre = centre
>         self.parent = parent
>         self.height = height
>         self.refinements = []
>                                     ^
>                                     Cannot coerce list to type 'list'

Hmm... looks like the c_python declaration of "list" is conflicting  
with the builtin list type which Cython now understands. Could you  
try with Cython 0.10.2? For now you can do self.refinements = <list>[]

What is the definition of list in c_python? If it's a cdef extern  
class of the actual python list, then this is a bug and should work.  
Also, you might not need c_python anymore.

- Robert