Update 0056.合并区间.md

Added python version code

problems/0056.合并区间.md

@@ -168,7 +168,21 @@ class Solution {
 ```
 
 Python：
-
+```python
+class Solution:
+    def merge(self, intervals: List[List[int]]) -> List[List[int]]:
+        if len(intervals) == 0: return intervals
+        intervals.sort(key=lambda x: x[0])
+        result = []
+        result.append(intervals[0])
+        for i in range(1, len(intervals)):
+            last = result[-1]
+            if last[1] >= intervals[i][0]:
+                result[-1] = [last[0], max(last[1], intervals[i][1])]
+            else:
+                result.append(intervals[i])
+        return result
+```
 
 Go：
 
@@ -179,4 +193,4 @@ Go：
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
 * B站视频：[代码随想录](https://space.bilibili.com/525438321)
 * 知识星球：[代码随想录](https://mp.weixin.qq.com/s/QVF6upVMSbgvZy8lHZS3CQ)
-<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>
+<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>