#ifndef NPY_IMPORT_H
#define NPY_IMPORT_H

#include <Python.h>

/*! \brief Fetch and cache Python function.
 *
 * Import a Python function and cache it for use. The function checks if
 * cache is NULL, and if not NULL imports the Python function specified by
 * \a module and \a function, increments its reference count, and stores
 * the result in \a cache. Usually \a cache will be a static variable and
 * should be initialized to NULL. On error \a cache will contain NULL on
 * exit,
 *
 * @param module Absolute module name.
 * @param function Function name.
 * @param cache Storage location for imported function.
 */
NPY_INLINE static void
npy_cache_pyfunc(const char *module, const char *function, PyObject **cache)
{
    if (*cache == NULL) {
        PyObject *mod = PyImport_ImportModule(module);

        if (mod != NULL) {
            *cache = PyObject_GetAttrString(mod, function);
            Py_DECREF(mod);
        }
    }
}

#endif

#ifndef NPY_IMPORT_H
#define NPY_IMPORT_H

#include <Python.h>
#include <assert.h>

/*! \brief Fetch and cache Python function.
 *
 * Import a Python function and cache it for use. The function checks if
 * cache is NULL, and if not NULL imports the Python function specified by
 * \a module and \a function, increments its reference count, and stores
 * the result in \a cache. Usually \a cache will be a static variable and
 * should be initialized to NULL. On error \a cache will contain NULL on
 * exit,
 *
 * @param module Absolute module name.
 * @param function Function name.
 * @param cache Storage location for imported function.
 */
NPY_INLINE void
npy_cache_pyfunc(const char *module, const char *function, PyObject **cache)
{
    if (*cache == NULL) {
        PyObject *mod = PyImport_ImportModule(module);

        if (mod != NULL) {
            *cache = PyObject_GetAttrString(mod, function);
            Py_DECREF(mod);
        }
    }
}

#endif

--- 
+++ 
@@ -2,7 +2,6 @@
 #define NPY_IMPORT_H
 
 #include <Python.h>
-#include <assert.h>
 
 /*! \brief Fetch and cache Python function.
  *
@@ -17,7 +16,7 @@
  * @param function Function name.
  * @param cache Storage location for imported function.
  */
-NPY_INLINE void
+NPY_INLINE static void
 npy_cache_pyfunc(const char *module, const char *function, PyObject **cache)
 {
     if (*cache == NULL) {
BUG: Fix npy_cache_pyfunc to properly implement inline.

The function was not static, which led to multiple definition
errors.
