求中位数

 1 #!/usr/bin/python3
 2 
 3 def calc_num(nums):
 4 
 5     #nums_1 = sorted(nums)
 6     if not nums:
 7         return None
 8         
 9     nums_1 = sorted(nums)
10     
11     le = len(nums_1)
12     
13     if le % 2 == 0:
14         return ((nums_1[le // 2 - 1] +nums_1[le // 2]) / 2 )
15 
16     else:
17         return (nums_1[le // 2])
18 
19 
20 nums = [3, 33, 989, 20, 7, 8]
21 
22 print(calc_num(nums))                  

1     b = [
2             {‘id‘: 101, ‘rating‘: 5.0},
3             {‘id‘: 102, ‘rating‘: 1.0},
4             {‘id‘: 102‘ ‘rating‘: 2.0},
5             {‘id‘: 102, ‘rating‘: 1.0},
6         ]