add solution isMonotonic python

readme.md

@@ -2,7 +2,7 @@
 
 | Name                                                      | Tags                    | Solution                                                                |
 | --------------------------------------------------------- | ----------------------- | ----------------------------------------------------------------------- |
-| Is-Monotonic                                              | `Arrays`                | [TypeScript](./src/algorithms/arrays/is-monotonic)                      |
+| Is-Monotonic                                              | `Arrays`                | [TypeScript](./src/algorithms/arrays/is-monotonic/is-monotonic.ts) ,  [Python](./src/algorithms/arrays/is-montonic/is_monotonic.py)                        |
 | 2D Array - DS                                             | `Arrays`                | [TypeScript](./src/algorithms/arrays/2d-array-ds)                       |
 | Left Rotation                                             | `Arrays`                | [TypeScript](./src/algorithms/arrays/left-rotation)                     |
 | New Year Chaos                                            | `Arrays`                | [TypeScript](./src/algorithms/arrays/new-year-chaos)                    |

src/algorithms/arrays/is-monotonic/is_monotonic.py

@@ -0,0 +1,26 @@
+"""
+Is Monotonic
+
+An array is monotonic if it is either monotone increasing or monotone decreasing.
+
+An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j].
+
+An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].
+
+Given an integer array nums, return true if the given array is monotonic, or false otherwise.
+
+"""
+
+from typing import List
+
+
+class Solution:
+    def isMonotonic(self, nums: List[int]) -> bool:
+        if nums[-1] - nums[0] < 0:
+            nums.reverse()
+
+        for i in range(len(nums) - 1):
+            if not (nums[i] <= nums[i + 1]):
+                return False
+
+        return True

src/algorithms/arrays/is-monotonic/test_is_monotonic.py

@@ -0,0 +1,19 @@
+import unittest
+from is_monotonic import Solution
+
+
+class TestIsMonotonic(unittest.TestCase):
+
+    def setUp(self):
+        self.solution = Solution()
+
+    def test_isMonotonic(self):
+        self.assertTrue(self.solution.isMonotonic([1, 2, 2, 3]))
+
+        self.assertTrue(self.solution.isMonotonic([6, 5, 4, 4]))
+
+        self.assertFalse(self.solution.isMonotonic([1, 3, 2]))
+
+
+if __name__ == '__main__':
+    unittest.main()