CDE

Task/Digital-root/Python/digital-root.py

@@ -0,0 +1,10 @@
+def droot (n):
+    x = [n]
+    while x[-1] > 10:
+        x.append(sum(int(dig) for dig in str(x[-1])))
+    return len(x) - 1, x[-1]
+
+for n in [627615, 39390, 588225, 393900588225]:
+    a, d = droot (n)
+    print "%12i has additive persistance %2i and digital root of %i" % (
+        n, a, d)