Update 0093.复原IP地址.md

加入了python3，更类似于LeetCode131题代码的写法，看起来更简洁些

problems/0093.复原IP地址.md

@@ -424,6 +424,30 @@ class Solution:
         return True
 ```
 
+python3; 简单拼接版本（类似Leetcode131写法）：
+```python
+class Solution: 
+    def restoreIpAddresses(self, s: str) -> List[str]:
+        global results, path
+        results = []
+        path = []
+        self.backtracking(s,0)
+        return results
+
+    def backtracking(self,s,index):
+        global results,path
+        if index == len(s) and len(path)==4:
+            results.append('.'.join(path)) # 在连接时需要中间间隔符号的话就在''中间写上对应的间隔符
+            return
+        for i in range(index,len(s)):
+            if len(path)>3: break          # 剪枝
+            temp = s[index:i+1]
+            if (int(temp)<256 and int(temp)>0 and temp[0]!='0') or (temp=='0'):
+                path.append(temp)
+                self.backtracking(s,i+1)
+                path.pop()      
+```
+
 ## Go 
 
 ```go