Update 0072.编辑距离.md

problems/0072.编辑距离.md

@@ -228,7 +228,22 @@ public int minDistance(String word1, String word2) {
 ```
 
 Python：
-
+```python
+class Solution:
+    def minDistance(self, word1: str, word2: str) -> int:
+        dp = [[0] * (len(word2)+1) for _ in range(len(word1)+1)]
+        for i in range(len(word1)+1):
+            dp[i][0] = i
+        for j in range(len(word2)+1):
+            dp[0][j] = j
+        for i in range(1, len(word1)+1):
+            for j in range(1, len(word2)+1):
+                if word1[i-1] == word2[j-1]:
+                    dp[i][j] = dp[i-1][j-1]
+                else:
+                    dp[i][j] = min(dp[i-1][j-1], dp[i-1][j], dp[i][j-1]) + 1
+        return dp[-1][-1]
+```
 
 Go：
 ```Go