Python通过成功地重复现有的字符串元素来创建一个新列表

Question

我有一个清单。我想通过为每个元素添加一个共同点来重复这些元素。main_list = ['lst1','lst2','lst3']  # existing listnew_list = ['lst1_mean','lst1_std','lst2_mean','lst2_std','lst3_mean','lst3_std']  # expected list我的代码：aux_list1 = [i+'_mean' for i in main_list]aux_list2 = [i+'_std' for i in main_list]new_list = [i,j for i,j in zip(aux_list1,aux_list2)]有更好的方法吗？

Answer 1

您可以简单地使用嵌套循环：

main_list = ['lst1', 'lst2', 'lst3']

suffixes = ['_mean', '_std']

new_list = [w + s for w in main_list for s in suffixes]

print(new_list)

输出：

['lst1_mean', 'lst1_std', 'lst2_mean', 'lst2_std', 'lst3_mean', 'lst3_std']

您还可以使用itertools.product（具有可变深度嵌套循环的概念）：

from itertools import product

main_list = ['lst1', 'lst2', 'lst3']

suffixes = ['_mean', '_std']

new_list = [''.join(w) for w in product(main_list, suffixes)]

print(new_list)

输出：

['lst1_mean', 'lst1_std', 'lst2_mean', 'lst2_std', 'lst3_mean', 'lst3_std']