Strip Specific Punctuation in Python 2.x

问题

I'm using Python v2.6 and I have a string which contains a number of punctuation characters I'd like to strip out. Now I've looked at using the string.punctuation() function but unfortunately, I want to strip out all punctuation characters except fullstops and dashes. In total, there are only a total of 5 punctuation marks I'd like to strip out - ()\"'

Any suggestions? I'd like this to be the most efficient way.

Thanks

回答1:

You can use str.translate(table[, deletechars]) with table set to None, which will result in all characters from deletechars being removed from the string:

s.translate(None, r"()\"'")

Some examples:

>>> "\"hello\" '(world)'".translate(None, r"()\"'")
'hello world'
>>> "a'b c\"d e(f g)h i\\j".translate(None, r"()\"'")
'ab cd ef gh ij'

回答2:

You could make a list of all the characters you don't want:

unwanted = ['(', ')', '\\', '"', '\'']

Then you could make a function strip_punctuation(s) like so:

def strip_punctuation(s): 
    for u in unwanted: 
        s = s.replace(u, '')
    return s

回答3:

>>> import re
>>> r = re.compile("[\(\)\\\\'\"]")
>>> r.sub("", "\"hello\" '(world)'\\\\\\")
'hello world'

回答4:

Using string.translate:

s = ''' abc(de)f\gh"i' '''
print(s.translate(None, r"()\"'"))
 # abcdefghi

or re.sub:

import re
re.sub(r"[\\()'\"]",'',s)

but string.translate appears to be an order of magnitude faster:

In [148]: %timeit (s*1000).translate(None, r"()\"'")
10000 loops, best of 3: 112 us per loop

In [146]: %timeit re.sub(r"[\\()'\"]",'',s*1000)
100 loops, best of 3: 2.11 ms per loop

回答5:

You can create a dict of all the characters you want to be replaced and replace them with char of your choice.

char_replace = {"'":"" , "(":"" , ")":"" , "\":"" , """:""}

for i,j in char_replace.iteritems():
        string = string.replace(i,j)

回答6:

my_string = r'''\(""Hello ''W\orld)'''
strip_chars = r'''()\'"'''

using comprehension:

''.join(x for x in my_string if x not in strip_chars)

using filter:

''.join(filter(lambda x: x not in strip_chars, my_string))

output:

Hello World

来源：https://stackoverflow.com/questions/8857885/strip-specific-punctuation-in-python-2-x

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