cython: hello world and primes examples

userland/libs/cython/helloworld.pyx

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+print("Hello World")

userland/libs/cython/main.py

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+#!/usr/bin/env python3
+
+import helloworld
+import primes
+
+print(primes.primes(4))

userland/libs/cython/primes.pyx

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+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

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

userland/libs/cython/test

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+#!/usr/bin/env bash
+set -eux
+python3 setup.py build_ext --inplace
+./main.py