How do I create a fixed-length, mutable array of Python objects in Cython?

If you only need few fixed sizes of such a structure, I'd look at making classes with uniformly named slots including one size slot to store the size. You'll need to declare a separate class for each size (number of slots). Define a cdecl function to access slots by index.

Access performance will probably be not as great as with plain address arithmetics of a C array, but you'll be sure that there's only so many slots and none more.

If you only need few fixed sizes of such a structure, I'd look at making classes with uniformly named __slots__, including one size slot to store the size. You'll need to declare a separate class for each size (number of slots). Define a cdecl function to access slots by index.

Access performance will probably be not as great as with plain address arithmetics of a C array, but you'll be sure that there's only so many slots and none more.

Class TrieNode(): def __init__(self, length = 32): self. Members = list() self. Length = length for I in range(length): self.members.

Append(None) def set(self, idx, item): if idx = 0: self. Membersidx = item else: print "ERROR: Specified index out of range." # Alternately, you could raise an IndexError. Def unset(self, idx): if idx = 0: self.

Membersidx = None else: raise IndexError("Specified index out of range (0..%d)." % self. Length).

My preference is assert 0 Lott Jan 29 at 0:03 Sorry, but this isn't even in the right ballpark of what I'm looking for. Two things: 1) I was looking for a way to do this in cython to create a C extension. 2) I don't have any way to force the list to take up exactly 32 elements.It has a len of 32, but usually more space is allocated to make appending easier.

– Jason Baker Jan 29 at 0:33.

I don't know about the best solution, but here's a solution: from cpython. Ref cimport PyObject, Py_XINCREF, Py_XDECREF DEF SIZE = 32 cdef class TrieNode: cdef PyObject *membersSIZE def __cinit__(self): cdef object temp_object for I in range(SIZE): temp_object = int(i) # increment its refcount so it's not gc'd. # We hold a reference to the object and are responsible for # decref-ing it in __dealloc__.

Py_XINCREF(temp_object) self. Membersi = temp_object def __init__(self): # just to show that it works... for I in range(SIZE): print self. Membersi def __dealloc__(self): # make sure we decref the members elements.

For I in range(SIZE): Py_XDECREF(self. Membersi) self. Membersi = NULL A Cython object is an automatically refcounted PyObject *.

You can always roll your own arrays of PyObject *'s as long as you take responsibility for refcounting the little buggers. This can be a major headache for non-trivial cases.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.