如何在有序列表中的单词长度每次发生变化时输入换行符？

Question

我已经创建了一个按降序排列的单词列表。每当列表中的单词长度发生变化时，我都要在后面加一个换行符。你知道吗

my_list = ['PAID','BATCH','CAKE','MY','CABLE']

my_list.sort(key = len, reverse = True)

print(' '.join(words_in_final))

电流输出

BATCH CABLE CAKE PAID MY

期望结果

BATCH CABLE

CAKE PAID

MY

或者

length 5
BATCH CABLE

length 4
CAKE PAID

length 2
MY

Answer 1

您可以使用^{}按长度对字符串进行分组，也可以按长度对字符串进行排序：

from itertools import groupby

[list(v) for _, v in groupby(sorted(my_list, key=len, reverse = True), key=len)]
# [['BATCH', 'CABLE'], ['PAID', 'CAKE'], ['MY']]

Answer 2

使用groupby：

from itertools import groupby

my_list = ['PAID','BATCH','CAKE','MY','CABLE']

print(*(list(g) for k, g in groupby(sorted(my_list, key=len, reverse=True), key=len)), sep='\n')

# ['BATCH', 'CABLE']
# ['PAID', 'CAKE']
# ['MY']

Answer 3

使用itertools.groupby

例如：

from itertools import groupby


my_list = ['PAID','BATCH','CAKE','MY','CABLE']
my_list.sort(key = len, reverse = True)

for l, v in groupby(my_list, len):
    print("length {}".format(l))
    print(" ".join(v))
    print()

输出：

length 5
BATCH CABLE

length 4
PAID CAKE

length 2
MY