Merge pull request #361 from abdulwd/issue#347

Add KMP search algorithm in python.

algorithms/kmp_search/python/KMPSearch.py

@@ -0,0 +1,28 @@
+class KMP:
+    def partial(self, pattern):
+        """ Calculate partial match table: String -> [Int]"""
+        ret = [0]
+
+        for i in range(1, len(pattern)):
+            j = ret[i - 1]
+            while j > 0 and pattern[j] != pattern[i]:
+                j = ret[j - 1]
+            ret.append(j + 1 if pattern[j] == pattern[i] else j)
+        return ret
+
+    def search(self, T, P):
+        """ 
+        KMP search main algorithm: String -> String -> [Int] 
+        Return all the matching position of pattern string P in S
+        """
+        partial, ret, j = self.partial(P), [], 0
+
+        for i in range(len(T)):
+            while j > 0 and T[i] != P[j]:
+                j = partial[j - 1]
+            if T[i] == P[j]: j += 1
+            if j == len(P): 
+                ret.append(i - (j - 1))
+                j = 0
+
+        return ret