python - 用python中的字符串列表替换一个字符串列表

Question

我有一个列表 ["a","b","c","a"] 我想用 替换 "a" ["a_1","b_1","c_1"] 这样列表就变成了 ["a_1","b_1","c_1","b","c", "a_1", “b_1”，“c_1”]

在 python 中执行此操作的最快方法是什么？

Answer 1

您可以使用 chain.from_iterable 的理解和三元语句:

from itertools import chain

L = list('abca')  # ['a', 'b', 'c', 'a']

rep_key, rep_val = ('a', ['a_1', 'b_1', 'c_1'])
res = list(chain.from_iterable([i] if i != rep_key else rep_val for i in L))

['a_1', 'b_1', 'c_1', 'b', 'c', 'a_1', 'b_1', 'c_1']