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+#!/usr/bin/python3
+
+'''
+
+Week 173:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-173
+
+Task #1: Esthetic Number
+
+    You are given a positive integer, $n.
+
+    Write a script to find out if the given number is Esthetic Number.
+
+'''
+
+import unittest
+
+def is_esthetic_number(n):
+    s = str(n)
+    for i in range(1, len(s)):
+        if abs(int(s[i-1]) - int(s[i])) != 1:
+            return False
+    return True
+
+#
+#
+# Unit test class
+
+class TestPrimePartition(unittest.TestCase):
+
+    def test_example_1(self):
+        self.assertTrue(is_esthetic_number(5456))
+
+    def test_example_2(self):
+        self.assertFalse(is_esthetic_number(120))
+
+unittest.main()