python - 使用其值逻辑组合两个 python 列表 - Python

Question

我想用 Python 将两个列表组合成一个列表，方法如下:

a = [1,1,1,2,2,2,3,3,3,3]

b= ["Sun", "is", "bright", "June","and" ,"July", "Sara", "goes", "to", "school"]

和输出:

c= ["Sun is bright", "June and July", "Sara goes to school"]

Answer 1

使用 for 循环首先将单词累积到某种映射数据结构中，然后使用列表理解来创建所需的输出。

>>> from collections import defaultdict
>>> d = defaultdict(list)
>>> for k, v in zip(a, b):
...     d[k].append(v)
...     
>>> [' '.join(d[k]) for k in sorted(d)]
['Sun is bright', 'June and July', 'Sara goes to school']