September Morn Update

Task/Remove-duplicate-elements/Python/remove-duplicate-elements-6.py

@@ -0,0 +1,22 @@
+from itertools import (groupby)
+
+
+# nubByKey :: (a -> b) -> [a] -> [a]
+def nubByKey(k, xs):
+    return list(list(v)[0] for _, v in groupby(sorted(xs, key=k), key=k))
+
+
+xs = [
+    'apple', 'apple',
+    'ampersand', 'aPPLE', 'Apple',
+    'orange', 'ORANGE', 'Orange', 'orange', 'apple'
+]
+for k in [
+    id,                      # default case sensitive uniqueness
+    lambda x: x.lower(),     # case-insensitive uniqueness
+    lambda x: x[0],          # unique first character (case-sensitive)
+    lambda x: x[0].lower(),  # unique first character (case-insensitive)
+]:
+    print (
+        nubByKey(k, xs)
+    )