Merge pull request #388 from haofengsiji/update2

Update 0139.单词拆分.md

problems/0139.单词拆分.md

@@ -252,6 +252,23 @@ class Solution {
 
 Python：
 
+```python3
+class Solution:
+    def wordBreak(self, s: str, wordDict: List[str]) -> bool:
+        '''排列'''
+        dp = [False]*(len(s) + 1)
+        dp[0] = True
+        # 遍历背包
+        for j in range(1, len(s) + 1):
+            # 遍历单词
+            for word in wordDict:
+                if j >= len(word):
+                    dp[j] = dp[j] or (dp[j - len(word)] and word == s[j - len(word):j])
+        return dp[len(s)]
+```
+
+
+
 
 Go：
 ```Go