Added Python solution for 238.Product of Array Except Self (#138)

Author: JoyKrishan

Algorithms/Medium/238_ProductOfArrayExceptSelf/Solution.py

@@ -0,0 +1,15 @@
+class Solution:
+    def productExceptSelf(self, nums: List[int]) -> List[int]:
+        prefix_prod = 1
+        postfix_prod = 1
+        res = []
+
+        for i in range(len(nums)):
+            res.append(prefix_prod)
+            prefix_prod *= nums[i]
+        
+        for i in range(len(nums) - 1, -1, -1):
+            res[i] = res[i] * postfix_prod
+            postfix_prod *= nums[i]
+        
+        return res