finish one 5 kyu

Author: sdwh

[6 kyu]Grouped by commas.py

@@ -0,0 +1,6 @@
+import re
+def group_by_commas(n):
+    return '{:,}'.format(n)
+
+print(group_by_commas(19234))
+print(group_by_commas(19255366477))