Bugfix 3115: Added not to documentation for python version for

facerecognizer interface + white + whitespaces remove

modules/contrib/doc/facerec/facerec_api.rst

@@ -70,6 +70,8 @@ Moreover every :ocv:class:`FaceRecognizer` supports the:
 
 * **Loading/Saving** the model state from/to a given XML or YAML.
 
+.. note:: When using the FaceRecognizer interface in combination with Python, please stick to Python 2. Some underlying scripts like create_csv will not work in other versions, like Python 3.
+
 Setting the Thresholds
 +++++++++++++++++++++++
 

samples/python2/facerec_demo.py

@@ -31,6 +31,11 @@
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
+# ------------------------------------------------------------------------------------------------
+# Note:
+# When using the FaceRecognizer interface in combination with Python, please stick to Python 2.
+# Some underlying scripts like create_csv will not work in other versions, like Python 3.
+# ------------------------------------------------------------------------------------------------
 
 import os
 import sys