How to add a static member to a Cython class (from python, not C)

Question

How would I add a static, typed member to a cython class? The syntax for adding typed instance-members uses the syntax as follows (e.g.):

import cython

cdef class NoStaticMembers:

   cdef public int instanceValue # but, how do I create a static member??

   def __init__(self, int value):
       self.instanceValue = value

Answer 1

Just because you can do it in C really doesn't mean you can do it in Cython.

A workround might involve using global variables, and class properties so you can access them through class instances. I'm not sure if it's really better than using global variables though

import cython

cdef int MyClass_static_variable

cdef class MyClass:
   property static_variable:
      def __get__(self):
         return MyClass_static_variable

      def __set__(self, x):
         global MyClass_static_variable
         MyClass_static_variable = x

You'd have to measure how much speed you lost through that method (and maybe consider making __get__ and __set__ cpdef if you can - I'm not sure). The only thing that doesn't let you do that a genuine static variable does is to access it as MyClass.static_variable.