Merge pull request thundergolfer#1 from mgbox/mbox

added a solution

Author: Jonathon Belotti

solutions/python/all-unique-characters.py

@@ -0,0 +1,10 @@
+# Check if a string is composed of all unique characters
+# author: Matt Box
+
+def all_unique(string):
+    letters = sorted(string)
+    for i in range(len(letters) - 1):
+        if letters[i] == letters[i + 1]:
+            return False
+    return True
+