30秒学会 Python 片段 – for_each_right.md

title: for_each_right
tags: list,beginner

Executes the provided function once for each list element, starting from the list’s last element.

Use a for loop in combination with slice notation to execute fn for each element in itr, starting from the last one.

代码实现

def for_each_right(itr, fn):
  for el in itr[::-1]:
    fn(el)

使用样例

for_each_right([1, 2, 3], print) # 3 2 1