python中如何去除標點符號

>>> string = "Special $#! characters spaces 888323" >>> ''.join(e for e in string if e.isalnum()) 'Specialcharactersspaces888323'

import re, string s ="string. With. Punctuation?" # Sample string # 写法一： out = s.translate(string.maketrans("",""), string.punctuation) # 写法二： out = s.translate(None, string.punctuation) # 写法三： exclude = set(string.punctuation) out = ''.join(ch for ch in s if ch not in exclude) # 写法四： >>> for c in string.punctuation: s = s.replace(c,"") >>> s 'string With Punctuation' # 写法五： out = re.sub('[%s]' % re.escape(string.punctuation), '', s) ## re.escape:对字符串中所有可能被解释为正则运算符的字符进行转义 # 写法六： # string.punctuation 只包括 ascii 格式； 想要一个包含更广（但是更慢）的方法是使用： unicodedata module : from unicodedata import category s = u'String — with - «Punctuation »...' out = re.sub('[%s]' % re.escape(string.punctuation), '', s) print 'Stripped', out # 输出：u'Stripped String \u2014 with \xabPunctuation \xbb' out = ''.join(ch for ch in s if category(ch)[0] != 'P') print 'Stripped', out # 输出：u'Stripped String with Punctuation ' # For Python 3 str or Python 2 unicode values, str.translate() only takes a dictionary; codepoints (integers) are looked up in that mapping and anything mapped to None is removed. # To remove (some?) punctuation then, use: import string remove_punct_map = dict.fromkeys(map(ord, string.punctuation)) s.translate(remove_punct_map) # Your method doesn't work in Python 3, as the translate method doesn't accept the second argument any more. import unicodedata import sys tbl = dict.fromkeys(i for i in range(sys.maxunicode) if unicodedata.category(chr(i)).startswith('P')) def remove_punctuation(text): return text.translate(tbl)

import re s ="string. With. Punctuation?" s = re.sub(r'[^\w\s]','',s)

import re, string, timeit s ="string. With. Punctuation" exclude = set(string.punctuation) table = string.maketrans("","") regex = re.compile('[%s]' % re.escape(string.punctuation)) def test_set(s): return ''.join(ch for ch in s if ch not in exclude) def test_re(s): return regex.sub('', s) def test_trans(s): return s.translate(table, string.punctuation) def test_repl(s): for c in string.punctuation: s=s.replace(c,"") return s print"sets :",timeit.Timer('f(s)', 'from __main__ import s,test_set as f').timeit(1000000) print"regex :",timeit.Timer('f(s)', 'from __main__ import s,test_re as f').timeit(1000000) print"translate :",timeit.Timer('f(s)', 'from __main__ import s,test_trans as f').timeit(1000000) print"replace :",timeit.Timer('f(s)', 'from __main__ import s,test_repl as f').timeit(1000000) out_put: # sets : 19.8566138744 # regex : 6.86155414581 # translate : 2.12455511093 # replace : 28.4436721802