Question

我有一项任务，我必须在句子中按照长度打印单词。例如：

Sentence: I like programming in python because it is very fun and simple.
>>> I
>>> in it is
>>> fun and
>>> like very
>>> python simple
>>> because

如果没有重复：

Sentence: Nothing repeated here
>>> here
>>> Nothing
>>> repeated

到目前为止，我到目前为止已经有了这个：

wordsSorted = sorted(sentence, key=len)

按照长度对单词进行排序，但我不知道如何从排序后的单词中获取正确的输出。任何帮助赞赏。我也明白需要词典，但我不确定。提前谢谢。

Answer 1

首先根据长度对单词进行排序，然后再次使用itertools.groupby对其进行分组：

>>> from itertools import groupby         
>>> s = 'I like programming in python because it is very fun and simple'
>>> for _, g in groupby(sorted(s.split(), key=len), key=len):
    print ' '.join(g)
...     
I
in it is
fun and
like very
python simple
because
programming

您也可以使用dict：

进行操作

>>> d = {}
>>> for word in s.split():
    d.setdefault(len(word), []).append(word)
...

现在d包含：

>>> d
{1: ['I'], 2: ['in', 'it', 'is'], 3: ['fun', 'and'], 4: ['like', 'very'], 6: ['python', 'simple'], 7: ['because'], 11: ['programming']}

现在我们需要迭代排序的键并获取相关的值：

>>> for _, v in sorted(d.items()):
    print ' '.join(v)
...     
I
in it is
fun and
like very
python simple
because
programming

如果您想忽略标点符号，则可以使用str.strip string.punctuation将其删除：

>>> from string import punctuation
>>> s = 'I like programming in python. Because it is very fun and simple.'
>>> sorted((word.strip(punctuation) for word in s.split()), key=len)
['I', 'in', 'it', 'is', 'fun', 'and', 'like', 'very', 'python', 'simple', 'Because', 'programming']

Answer 2

这可以在O（N）时间内使用defaultdict（或常规字典）来完成。 sort + groupby是O（N log N）

words = "I like programming in python because it is very fun and simple".split()
from collections import defaultdict
D = defaultdict(list)
for w in words:
    D[len(w)].append(w)

for k in sorted(D):
    print " ".join(d[k])

I
in it is
fun and
like very
python simple
because
programming

Answer 3

试试这个：

str='I like programming in python because it is very fun and simple'

l=str.split(' ')
sorted(l,key=len)

它会返回

['I', 'in', 'it', 'is', 'fun', 'and', 'like', 'very', 'python', 'simple', 'because', 'programming']

Answer 4

使用字典简化了它

input = "I like programming in python because it is very fun and simple."
output_dict = {}
for word in input.split(" "):
    if not word[-1].isalnum():
        word = word[:-1]
    if len(word) not in output_dict:
        output_dict[len(word)] = []
    output_dict[len(word)].append(word)
for key in sorted(output_dict.keys()):
    print " ".join(output_dict[key])

这实际上删除了句子中的逗号，分号或句号。

Python - 按长度打印单词

4 个答案: