hackerrank string exercise

Chapter 1 Arrays and strings/hackerrank/super_reduced_string.py

@@ -0,0 +1,46 @@
+# Algorithms > Strings > Super Reduced String
+# https://www.hackerrank.com/challenges/reduced-string
+
+import unittest
+
+def reduce_string(s):
+    slen = len(s)
+    if slen < 2:
+        return "Empty String" if len(s) == 0 else s
+    
+    i = 0
+    count = 0
+    while slen > 1 and i < slen - 1:
+        if s[i] == s[i+1]:
+            count += 1
+            
+        if count % 2 == 1:
+            s = s.replace(s[i] * (count+1), '')
+            i -= count + 1
+            if i < -1:
+                i = -1
+            slen = len(s)
+            count = 0
+            
+        i += 1
+    
+    return "Empty String" if len(s) == 0 else s
+    
+class Test(unittest.TestCase):
+    
+    data = [('', "Empty String"),
+            ('aaabbb', 'ab'),
+            ('aabb', "Empty String"),
+            ('aadbbc', 'dc'),
+            ('abcdeedcba', "Empty String"),
+            ('abcdeeedcba', 'abcdedcba'),
+            ('aabbbcaacbd', 'd'),
+            ('ppffccmmssnnhhbbmmggxxaaooeeqqeennffzzaaeeyyaaggggeessvvssggbbccnnrrjjxxuuzzbbjjrruuaaccaaoommkkkkxx', 'Empty String')]
+    
+    def test(self):
+        for test_string in self.data:
+            res = reduce_string(test_string[0])
+            self.assertEqual(res, test_string[1])
+
+if __name__ == "__main__":
+    unittest.main()