Add Python

Author: LokiSharp

2.selectionSort.md

@@ -36,4 +36,15 @@ function selectionSort(arr) {
     }
     return arr;
 }
-```
+```
+
+## 4. Python 代码实现
+
+```python
+def selectionSort(arr):
+    for i in range(len(arr)-1):
+        for j in range(i+1, len(arr)):
+            if arr[j] < arr[i]:
+                arr[i], arr[j] = arr[j], arr[i]
+    return arr
+```