Create thousand-separator.py

Author: kamyu104

Python/thousand-separator.py

@@ -0,0 +1,16 @@
+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def thousandSeparator(self, n):
+        """
+        :type n: int
+        :rtype: str
+        """
+        result = []
+        s = str(n)
+        for i, c in enumerate(str(n)):
+            if i and (len(s)-i)%3 == 0:
+                result.append(".")
+            result.append(c)
+        return "".join(result)