Completed lucky_sum.py

Author: Alfredo Miranda

python/list-2/lucky_sum.py

@@ -0,0 +1,14 @@
+# Given 3 int values, a b c, return their sum. However, if one of the values 
+# is 13 then it does not count towards the sum and values to its right do not 
+# count. So for example, if b is 13, then both b and c do not count.
+def lucky_sum(a, b, c):
+    if a == 13:
+        return 0
+        
+    if b == 13:
+        return a
+                
+    if c == 13:
+        return a + b
+        
+    return a + b + c