Basic algorithm for finding Digital Root

Basic-Scripts/digital_root.py

@@ -0,0 +1,15 @@
+"""
+The digital root (also repeated digital sum) of a natural number in 
+a given number base is the (single digit) value obtained by an iterative 
+process of summing digits, on each iteration using the result from the previous 
+iteration to compute a digit sum. The process continues until a single-digit number 
+is reached. - https://en.wikipedia.org/wiki/Digital_root
+
+> digital_root(52)
+// 7
+(5 + 2)
+"""
+
+
+def digital_root(n):
+    return (n - 1) % 9 + 1 if n else 0