Python split 函数不适用于列表以生成列表列表

Question

我正在学习python并做了以下实验。

    text = "this is line one . this is line two . this is line three ."
    
    tokens = text.split(" ")            # split text into token with seperator "space"
    lioftokens = tokens.split(".")      # split tokens into list of tokens with seperator "dot"
    
    print(tokens)                       # output = ['this', 'is', 'line', 'one', '.', 'this', 'is', 'line', 'two', '.', 'this', 'is', 'line', 'three', '.']
    print(lioftokens)                   # expected output = [['this', 'is', 'line', 'one', '.'],
                                        #                    ['this', 'is', 'line', 'two', '.'],
                                        #                    ['this', 'is', 'line', 'three', '.']]

它给出了错误而不是预期的输出。

split() 用于字符串，而不是列表。 我该如何解决？

#IamNewToPython

Answer 1

尝试使用list 理解：

text = "this is line one . this is line two . this is line three ."
print([line.rstrip().split() for line in text.split('.') if line])

输出：

[['this', 'is', 'line', 'one'], ['this', 'is', 'line', 'two'], ['this', 'is', 'line', 'three']]

如果您想保留拆分器，请尝试：

import re
text = "this is line one . this is line two . this is line three ."
print([line.rstrip().split() for line in re.split('([^\.]*\.)', text) if line])

输出：

[['this', 'is', 'line', 'one', '.'], ['this', 'is', 'line', 'two', '.'], ['this', 'is', 'line', 'three', '.']]

编辑：

如果你想做列表拆分尝试：

l = ['this', 'is', 'line', 'one', '.', 'this', 'is', 'line', 'two', '.', 'this', 'is', 'line', 'three', '.']
newl = [[]]
for i in l:
    newl[-1].append(i)
    if i == '.':
        newl.append([])
print(newl)

输出：

[['this', 'is', 'line', 'one', '.'], ['this', 'is', 'line', 'two', '.'], ['this', 'is', 'line', 'three', '.'], []]

Answer 2

str.split() 方法。

text = "this is line one . this is line two . this is line three ."

print([text.split()[i:i+5] for i in range(0,len(text.split()),5) ])

Answer 3

text = "this is line one . this is line two . this is line three ."

# first split on the periods
sentences = text.split('.')

for s in sentences:
    # chop off trailing whitespace and then split on spaces
    print(s.rstrip().split())

Answer 4

这行得通：

>>> text = "this is line one . this is line two . this is line three ."
>>> list(filter(None, map(str.split, text.split("."))))
[['this', 'is', 'line', 'one'],
 ['this', 'is', 'line', 'two'],
 ['this', 'is', 'line', 'three']]

您可以先通过. 简单地将列表拆分，然后将map 和str.split 简单地拆分为列表中的每个单独的字符串。