Add light sources examples.

colour/examples/colorimetry/examples_light_sources.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Showcases light sources dataset.
+"""
+
+from __future__ import division, unicode_literals
+
+from pprint import pprint
+
+import colour
+from colour.utilities.verbose import message_box
+
+message_box('Light Sources Dataset')
+
+message_box('Light sources relative spectral power distributions dataset.')
+pprint(sorted(colour.LIGHT_SOURCES_RELATIVE_SPDS.keys()))
+
+print('\n')
+
+message_box('Light sources chromaticity coordinates dataset.')
+# Filtering aliases.
+observers = dict(((observer, dataset)
+                  for observer, dataset in sorted(colour.LIGHT_SOURCES.items())
+                  if ' ' in observer))
+for observer, light_source in observers.items():
+    print('"{0}".'.format(observer))
+    for illuminant, xy in sorted(light_source.items()):
+        print('\t"{0}": {1}'.format(illuminant, xy))
+    print('\n')