Merge pull request #1137 from ivan1016017/december30

adding valid parentheses

Author: ivan1016017

src/my_project/interviews/top_150_questions_round_12/valid_parentheses.py

@@ -0,0 +1,16 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isValid(self, s):
+
+        dic_parentheses = {'(':')','[':']','{':'}'}
+        check_lst = list()
+
+        for p in s:
+            if p in dic_parentheses:
+                check_lst.append(p)
+            elif len(check_lst) == 0 or p != dic_parentheses[check_lst.pop()]:
+                return False 
+            
+        return len(check_lst) == 0

tests/test_150_questions_round_12/test_valid_parentheses_round_12.py

@@ -0,0 +1,20 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_12\
+.valid_parentheses import Solution
+
+class ValidParenthesesTestCase(unittest.TestCase):
+
+    def test_is_valid_parentheses(self):
+        solution = Solution()
+        output = solution.isValid(s='()')
+        self.assertTrue(output)
+
+    def test_is_no_valid_parentheses_pattern_1(self):
+        solution = Solution()
+        output = solution.isValid(s='(]')
+        self.assertFalse(output)
+
+    def test_is_no_valid_parentheses_pattern_2(self):
+        solution = Solution()
+        output = solution.isValid(s='((')
+        self.assertFalse(output)