Python 如何获取句子中单词的长度？
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How to get the length of words in a sentence?
提问by Reymy
I am trying to get the length of each word in a sentence. I know you can use the "len" function, I just don't know how to get the length of each word.
我正在尝试获取句子中每个单词的长度。我知道你可以使用“len”函数，我只是不知道如何获得每个单词的长度。
Instead of this
而不是这个
>>> s = "python is pretty fun to use"
>>> len(s)
27
>>>
I'd like to get this
我想得到这个
6, 2, 6, 3, 2, 3
which is the actual length of every word.
这是每个单词的实际长度。
采纳答案by óscar López
Try this, using map()for applying len()over each word in the sentence, understanding that split()creates a list with each word in the sentence:
试试这个，map()用于应用len()句子中的每个单词，理解为句子中的每个单词split()创建一个列表：
s = "python is pretty fun to use"
map(len, s.split()) # assuming Python 2.x
list(map(len, s.split())) # assuming Python 3.x
Or alternatively, you can use a list comprehensionfor the same effect:
或者，您可以使用列表理解来达到相同的效果：
[len(x) for x in s.split()]
In both cases the result is a list with the length of each word in the sentence:
在这两种情况下，结果都是一个包含句子中每个单词长度的列表：
[6, 2, 6, 3, 2, 3]
回答by óscar López
>>> s = "python is pretty fun to use"
>>> map(len, s.split())
[6, 2, 6, 3, 2, 3]
>>>
1Note: mapreturns an iterator in Python 3. If you are using that version, you may want to place it in listto get a list of integers like the Python 2 mapreturns:
1注意：map在 Python 3 中返回一个迭代器。如果您使用该版本，您可能希望将其放入list以获取整数列表，如 Python 2map返回：
>>> # Python 3 interpreter
>>> s = "python is pretty fun to use"
>>> map(len, s.split())
<map object at 0x02364ED0>
>>> list(map(len, s.split()))
[6, 2, 6, 3, 2, 3]
>>>
回答by agconti
Use this:
用这个：
s = "python is pretty fun to use"
[len(x) for x in s.split()]
example output:
示例输出：
>>> [len(x) for x in s.split()]
[6, 2, 6, 3, 2, 3]
What's going on in the background?
后台发生了什么？
s.split()breaks on the white space in the string and returns each word in the sentence in a list:
s.split()在字符串中的空白处中断并以列表形式返回句子中的每个单词：
>>> s.split()
['python', 'is', 'pretty', 'fun', 'to', 'use']
Then we take the len()of each of those words to get the word's length. After that, we take each length and append it to a list so that it can be conveniently returned as the result.
然后我们取len()每个单词的 得到单词的长度。之后，我们获取每个长度并将其附加到列表中，以便可以方便地将其作为结果返回。
That all happens in this list comprehension:
这一切都发生在这个列表理解中：
[len(x) for x in s.split()]
Still a little confused? This is conceptually the same thing just broken down more explicitly:
还是有点迷茫？这在概念上是同一件事，只是更明确地分解了：
results = []
for x in s.split():
word_length = len(x)
results.append(word_length)
print results
If you'd like them printed out separately, like in your question, use:
如果您希望将它们分开打印，就像在您的问题中一样，请使用：
for x in [len(x) for x in s.split()]:
print x
回答by JerryPlayz101
iCodez is right - but it requires a few minor adjustments from script form.
iCodez 是对的 - 但它需要对脚本形式进行一些小的调整。
s = 'python is pretty fun to use'
li = list(map(len, s.split()))
then type into the shell or print statement:
然后在 shell 或 print 语句中输入：
print(li)
