30秒学会 Python 片段 – median

Finds the median of a list of numbers.

Sort the numbers of the list using list.sort() and find the median, which is either the middle element of the list if the list length is odd or the average of the two middle elements if the list length is even.

statistics.median() provides similar functionality to this snippet.

代码实现

def median(list):
  list.sort()
  list_length = len(list)
  if list_length % 2 == 0:
    return (list[int(list_length / 2) - 1] + list[int(list_length / 2)]) / 2
  return list[int(list_length / 2)]

使用样例

median([1,2,3]) # 2
median([1,2,3,4]) # 2.5