[英]Python removing delimiters from strings
I have 2 related questions/ issues. 我有2个相关问题。
def remove_delimiters (delimiters, s):
for d in delimiters:
ind = s.find(d)
while ind != -1:
s = s[:ind] + s[ind+1:]
ind = s.find(d)
return ' '.join(s.split())
delimiters = [",", ".", "!", "?", "/", "&", "-", ":", ";", "@", "'", "..."]
d_dataset_list = ['hey-you...are you ok?']
d_list = []
for d in d_dataset_list:
d_list.append(remove_delimiters(delimiters, d[1]))
print d_list
Output = 'heyyouare you ok'
输出=
'heyyouare you ok'
What is the best way of avoiding strings being combined together when a delimiter is removed? 删除定界符时避免字符串合并在一起的最佳方法是什么? For example, so that the output is
hey you are you ok
? 例如,这样输出就
hey you are you ok
?
There may be a number of different sequences of ...
, for example ..
or ..........
etc. How does one go around implementing some form of rule, where if more than one .
可能有许多不同的序列
...
,例如..
或..........
等等如何去实现左右某种形式的规则,其中如果超过一个.
appear after each other, to remove it? 出现之后,要删除吗? I want to try and avoid hard-coding all sequences in my delimiters list.
我想尝试避免对分隔符列表中的所有序列进行硬编码。 Thankyou
谢谢
You could try something like this: 您可以尝试这样的事情:
Given delimiters d
, join them to a regular expression 给定定界符
d
,将它们加入正则表达式
>>> d = ",.!?/&-:;@'..." >>> "["+"\\\\".join(d)+"]" "[,\\\\.\\\\!\\\\?\\\\/\\\\&\\\\-\\\\:\\\\;\\\\@\\\\'\\\\.\\\\.\\\\.]"
Split the string using this regex with re.split
使用此正则表达式和
re.split
分割字符串
>>> s = 'hey-you...are you ok?' >>> re.split("["+"\\\\".join(d)+"]", s) ['hey', 'you', '', '', 'are you ok', '']
Join all the non-empty fragments back together 将所有非空片段重新连接在一起
>>> ' '.join(w for w in re.split("["+"\\\\".join(d)+"]", s) if w) 'hey you are you ok'
Also, if you just want to remove all non-word characters, you can just use the character group \\W
instead of manually enumerating all the delimiters: 另外,如果只想删除所有非单词字符,则可以使用字符组
\\W
而不是手动枚举所有定界符:
>>> ' '.join(w for w in re.split(r"\W", s) if w)
'hey you are you ok'
So first of all, your function for removing delimiters could be simplified greatly by using the replace function ( http://www.tutorialspoint.com/python/string_replace.htm ) 因此,首先,可以通过使用replace函数( http://www.tutorialspoint.com/python/string_replace.htm )大大简化删除定界符的功能
This would help solve your first question. 这将有助于解决您的第一个问题。 Instead of just removing them, replace with a space, then get rid of the spaces using the pattern you already used (split() treats consecutive delimiters as one)
而不是仅仅删除它们,而是替换为一个空格,然后使用您已经使用的模式消除这些空格(split()将连续的定界符视为一个)
A better function, which does this, would be: 一个更好的功能是:
def remove_delimiters (delimiters, s):
new_s = s
for i in delimiters: #replace each delimiter in turn with a space
new_s = new_s.replace(i, ' ')
return ' '.join(new_s.split())
to answer your second question, I'd say it's time for regular expressions 回答您的第二个问题,我想是时候使用正则表达式了
>>> import re
... ss = 'hey ... you are ....... what?'
... print re.sub('[.+]',' ',ss)
hey you are what?
>>>
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