5.3:最小编辑距离

ebook/code/python/5.3：字符串编辑距离.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+最小编辑距离
+"""
+def Edit_Distance(src, tar):
+    srcLength = len(src)
+    tarLength = len(tar)
+    matrix = [[i+j for j in range(tarLength + 1)] for i in range(srcLength + 1)]
+    for i in range(1,srcLength+1):
+        matrix[i][0] = i
+    for j in range(1,tarLength+1):
+        matrix[0][j] = j
+    for i in range(1,srcLength+1):
+        for j in range(1,tarLength+1):
+            if src[i-1] == tar[j-1]:
+                matrix[i][j] = matrix[i-1][j-1]
+            else:
+                matrix[i][j] =min(matrix[i-1][j-1] +1, 1+ min(matrix[i-1][j], matrix[i][j-1]))
+    for i in matrix:
+        print(i)
+    print(matrix[srcLength][tarLength])
+    return matrix[srcLength][tarLength]
+
+if __name__ == "__main__":
+    # src = 'abddcdefdgbd22svb'
+    # tar = 'bcdefg34rdyvdfsd'
+    # src = 'ofailing'
+    # tar = 'osailn'
+    src = "string"
+    tar = "story"
+    Edit_Distance(src, tar)