Python

Question

我有以下字符串：

input = "I love programming with Python-3.3! Do you? It's great... I give it a 10/10. It's free-to-use, no $$$ involved!"

除“/”、“'”、“-”、“+”和“$”外，所有标点符号都应与单词分开。

所以输出应该是：

"I love programming with Python-3 . 3 ! Do you ? It's great . . . I give it a 10/10. It's free-to-use , no $$$ involved !"

我使用了以下代码：

for x in string.punctuation:
    if x == "/":
        continue
    if x == "'":
        continue
    if x == "-":
        continue
    if x == "+":
        continue
    if x == "$":
        continue
    input = input.replace(x," %s " % x)

我得到以下输出：

I love programming with Python-3 . 3 !  Do you ?  It's great .  .  .  I give it a 10/10 .  It's free-to-use ,  no $$$ involved !

可以，但问题是它有时会在标点符号和单词之间留下两个 space，例如在句子中的第一个感叹号和单词 "Do" 之间。这是因为它们之间已经有一个space。

这个问题也会发生在：input = "Hello. (hi)"。输出将是：

" Hello .  ( hi ) "

注意左括号前的两个 space。

我需要的输出只有一个space在任何标点符号和单词之间，除了上面提到的5个标点符号，它们不与单词分开。我怎样才能解决这个问题？或者，是否有使用正则表达式执行此操作的更好方法？

提前致谢。

Answer 1

我可以这样试试吗:

>>> import string
>>> input = "I love programming with Python-3.3! Do you? It's great... I give it a 10/10. It's free-to-use, no $$$ involved!"
>>> ls = []
>>> for x in input:
...     if x in string.punctuation:
...         ls.append(' %s' % x)
...     else:
...         ls.append(x)
...
>>> ''.join(ls)
"I love programming with Python -3 .3 ! Do you ? It 's great . . . I give it a 10 /10 . It 's free -to -use , no  $ $ $ involved !"
>>>

Answer 2

看起来 re 可以为你做...

>>> import re
>>> re.sub(r"([\w/'+$\s-]+|[^\w/'+$\s-]+)\s*", r" ", input)
"I love programming with Python-3 . 3 ! Do you ? It's great ... I give it a 10/10 . It's free-    to-use , no $$$ involved ! "

和

>>> re.sub(r"([\w/'+$\s-]+|[^\w/'+$\s-]+)\s*", r" ", "Hello. (hi)")
'Hello . ( hi ) '

如果尾随 space 有问题，.rtrim(theresult, ' ') 应该会为您解决:-)

Answer 3

由于缺乏声誉而无法发表评论，但在这种情况下

between the first exclamation mark in the sentence and the word "Do"

好像有两个space因为中间已经有一个space了！和做

! Do

所以，如果标点后面已经有space，就不要再放space了。

另外，这里也有类似的问题：python regex inserting a space between punctuation and letters

所以可以考虑使用 re？

Answer 4

在我看来否定字符class更简单：

import re

input_string = "I love programming with Python-3.3! Do you? It's great... I give it a 10/10. It's free-to-use, no $$$ involved!"

print re.sub(r"\s?([^\w\s'/\-\+$]+)\s?", r"  ", input_string)

输出：

I love programming with Python-3 . 3 ! Do you ? It's great ... I give it a 10/10 . It's free-to-use , no $$$ involved !

Answer 5

# Approach 1

import re

sample_input = "I love programming with Python-3.3! Do you? It's great... I give it a 10/10. It's free-to-use, no $$$ involved!"

sample_input = re.sub(r"([^\s])([^\w\/'+$\s-])", r' ', sample_input)
print(re.sub(r"([^\w\/'+$\s-])([^\s])", r' ', sample_input))

# Approach 2

import string

sample_input = "I love programming with Python-3.3! Do you? It's great... I give it a 10/10. It's free-to-use, no $$$ involved!"

punctuation = string.punctuation.replace('/', '').replace("'", '') \
        .replace('-', '').replace('+', '').replace('$', '')

i = 0

while i < len(sample_input):
    if sample_input[i] not in punctuation:
        i += 1
        continue

    if i > 0 and sample_input[i-1] != ' ':
        sample_input = sample_input[:i] + ' ' + sample_input[i:]
        i += 1

    if i + 1 < len(sample_input) and sample_input[i+1] != ' ':
        sample_input = sample_input[:i+1] + ' ' + sample_input[i+1:]
        i += 1

    i += 1

print(sample_input)

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