我不確定如何在python 3.xx中完成此問題，請定義一個帶一個參數(shù)的words函數(shù)：1.文本，字符串文本包含帶有單詞的句子，單詞之間用空格分隔并以句點(diǎn)結(jié)尾。該函數(shù)返回一個word / sentenceList對的字典，其中word是文本中的每個不同單詞，而句子列表是該單詞出現(xiàn)的句子索引列表。注意：例如，如果text ='I say，您的代碼對大小寫不敏感。我的意思是。我的意思是我說的。我做。”函數(shù)返回{'i“：[0,1,2]，'say'：[0,1]，'what'：[0,1]，'mean'：[0,1]，'要做：[2]}
2 回答
HUH函數(shù)
TA貢獻(xiàn)1836條經(jīng)驗(yàn) 獲得超4個贊
由于某些原因，人們經(jīng)常問如何在沒有defaultdict的情況下執(zhí)行此操作
>>> text= "I say what I mean. I mean what I say. i do."
>>> sentences = text.lower().split('.')
>>> dic = {}
>>> for i, sen in enumerate(sentences):
... for word in sen.split():
... if word not in dic: # you just need these
... dic[word] = set() # two extra lines
... dic[word].add(i)
...
>>> dic
{'i': set([0, 1, 2]), 'do': set([2]), 'say': set([0, 1]), 'what': set([0, 1]), 'mean': set([0, 1])}
如果您確實(shí)想要列表，可以通過以下修改來做到這一點(diǎn)
>>> text= "I say what I mean. I mean what I say. i do."
>>> sentences = text.lower().split('.')
>>> dic = {}
>>> for i, sen in enumerate(sentences):
... for word in sen.split():
... if word not in dic:
... dic[word] = [i]
... elif dic[word][-1] != i: # this prevents duplicate entries
... dic[word].append(i)
...
>>> dic
{'i': [0, 1, 2], 'do': [2], 'say': [0, 1], 'what': [0, 1], 'mean': [0, 1]}
如果您甚至不被允許使用枚舉
>>> text= "I say what I mean. I mean what I say. i do."
>>> sentences = text.lower().split('.')
>>> dic = {}
>>> i = -1
>>> for sen in sentences:
... i += 1
... for word in sen.split():
... if word not in dic:
... dic[word] = [i]
... elif dic[word][-1] != i: # this prevents duplicate entries
... dic[word].append(i)
...
>>> dic
{'i': [0, 1, 2], 'do': [2], 'say': [0, 1], 'what': [0, 1], 'mean': [0, 1]}
暮色呼如
TA貢獻(xiàn)1853條經(jīng)驗(yàn) 獲得超9個贊
您可以collections.defaultdict在這里使用：
>>> from collections import defaultdict
>>> text= "I say what I mean. I mean what I say. i do."
# convert the text to lower-case and split at `'.'` to get the sentences.
>>> sentences = text.lower().split('.')
>>> dic = defaultdict(set) #sets contain only unique iteme
for i,sen in enumerate(sentences): #use enumerate to get the sentence as well as index
for word in sen.split(): #split the sentence at white-spaces to get words
dic[word].add(i)
>>> dic
defaultdict(<type 'set'>,
{'i': set([0, 1, 2]),
'do': set([2]),
'say': set([0, 1]),
'what': set([0, 1]),
'mean': set([0, 1])})
使用普通字典：
>>> dic = {}
for i,sen in enumerate(sentences):
for word in sen.split():
dic.setdefault(word,set()).add(i)
...
>>> dic
{'i': set([0, 1, 2]),
'do': set([2]),
'say': set([0, 1]),
'what': set([0, 1]),
'mean': set([0, 1])}
沒有enumerate：
>>> dic = {}
>>> index = 0
for sen in sentences:
for word in sen.split():
dic.setdefault(word,set()).add(index)
index += 1
...
>>> dic
{'i': set([0, 1, 2]), 'do': set([2]), 'say': set([0, 1]), 'what': set([0, 1]), 'mean': set([0, 1])}
添加回答
舉報(bào)
0/150
提交
取消