30秒学会 Python 片段 – Max list value based on function

Returns the maximum value of a list, after mapping each element to a value using the provided function.

• Use map() with fn to map each element to a value using the provided function.
• Use max() to return the maximum value.

代码实现

def max_by(lst, fn):
  return max(map(fn, lst))

使用样例

max_by([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], lambda v : v['n']) # 8

翻译自：https://www.30secondsofcode.org/python/s/max-by