cython: hello world and primes examples

path_properties.py

@@ -698,6 +698,7 @@ path_properties_tuples = (
                 'libs': (
                     {'requires_dynamic_library': True},
                     {
+                        'cython': {'no_build': True},
                         'libdrm': {'requires_sudo': True},
                         'hdf5': (
                             {},

requirements.txt

@@ -1 +1,2 @@
+Cython==0.29.15
 pexpect==4.6.0

userland/libs/cython/helloworld.pyx

@@ -0,0 +1 @@
+print("Hello World")

userland/libs/cython/main.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+
+import helloworld
+import primes
+
+print(primes.primes(4))

userland/libs/cython/primes.pyx

@@ -0,0 +1,23 @@
+def primes(int nb_primes):
+    cdef int n, i, len_p
+    cdef int p[1000]
+    if nb_primes > 1000:
+        nb_primes = 1000
+
+    len_p = 0  # The current number of elements in p.
+    n = 2
+    while len_p < nb_primes:
+        # Is n prime?
+        for i in p[:len_p]:
+            if n % i == 0:
+                break
+
+        # If no break occurred in the loop, we have a prime.
+        else:
+            p[len_p] = n
+            len_p += 1
+        n += 1
+
+    # Let's return the result in a python list:
+    result_as_list  = [prime for prime in p[:len_p]]
+    return result_as_list

userland/libs/cython/setup.py

@@ -0,0 +1,6 @@
+from distutils.core import setup
+from Cython.Build import cythonize
+
+setup(
+    ext_modules = cythonize(['*.pyx']),
+)

userland/libs/cython/test

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -eux
+python3 setup.py build_ext --inplace
+./main.py