首先根據(jù)長(zhǎng)度對(duì)單詞進(jìn)行排序，然后再次使用itertools.groupby對(duì)它們進(jìn)行分組：

>>> 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執(zhí)行此操作：

>>> d = {}

>>> for word in s.split():

d.setdefault(len(word), []).append(word)

...現(xiàn)在d包含：

>>> d

{1: ['I'], 2: ['in', 'it', 'is'], 3: ['fun', 'and'], 4: ['like', 'very'], 6: ['python', 'simple'], 7: ['because'], 11: ['programming']}現(xiàn)在我們需要遍歷排序鍵并獲取相關(guān)值：

>>> for _, v in sorted(d.items()):

print ' '.join(v)

...

I

in it is

fun and

like very

python simple

because

programming

如果你想忽略標(biāo)點(diǎn)符號(hào)，那么你可以使用string.punctuation和PLACEHOLDER_FOR_CODE_8去掉它們：

>>> 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']

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