1 files changed, 22 insertions, 21 deletions
diff --git a/docs/examples/tutorial/cython_tutorial/primes_cpp.pyx b/docs/examples/tutorial/cython_tutorial/primes_cpp.pyx
index 57bfe9cc2..afef8bd13 100644
--- a/docs/examples/tutorial/cython_tutorial/primes_cpp.pyx
+++ b/docs/examples/tutorial/cython_tutorial/primes_cpp.pyx
@@ -1,21 +1,22 @@
-# distutils: language=c++
-
-from libcpp.vector cimport vector
-
-def primes(unsigned int nb_primes):
-    cdef int n, i
-    cdef vector[int] p
-    p.reserve(nb_primes)  # allocate memory for 'nb_primes' elements.
-
-    n = 2
-    while p.size() < nb_primes:  # size() for vectors is similar to len()
-        for i in p:
-            if n % i == 0:
-                break
-        else:
-            p.push_back(n)  # push_back is similar to append()
-        n += 1
-
-    # Vectors are automatically converted to Python
-    # lists when converted to Python objects.
-    return p
+# distutils: language=c++
+
+
+from libcpp.vector cimport vector
+
+def primes(unsigned int nb_primes):
+    cdef int n, i
+    cdef vector[int] p
+    p.reserve(nb_primes)  # allocate memory for 'nb_primes' elements.
+
+    n = 2
+    while p.size() < nb_primes:  # size() for vectors is similar to len()
+        for i in p:
+            if n % i == 0:
+                break
+        else:
+            p.push_back(n)  # push_back is similar to append()
+        n += 1
+
+    # If possible, C values and C++ objects are automatically
+    # converted to Python objects at need.
+    return p  # so here, the vector will be copied into a Python list.