Merge pull request #259 from jenliketen/master

添加0349.两个数组的交集 python3版本

problems/0349.两个数组的交集.md

@@ -118,6 +118,17 @@ class Solution {
 ```
 
 Python：
+```python3
+class Solution:
+    def intersection(self, nums1: List[int], nums2: List[int]) -> List[int]:
+        result_set = set()
+        
+        set1 = set(nums1)
+        for num in nums2:
+            if num in set1:
+                result_set.add(num) # set1里出现的nums2元素 存放到结果
+        return result_set
+```
 
 
 Go：