Python-提取每个子列表的第一项

Question

lst = [[a,b,c], [1,2,3], [x,y,z]]

Answer 1

使用列表理解：

>>> lst = [['a','b','c'], [1,2,3], ['x','y','z']]
>>> lst2 = [item[0] for item in lst]
>>> lst2
['a', 1, 'x']