python中去除标点符号的方法-创新互联

这篇文章将为大家详细讲解有关python中去除标点符号的方法,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。

成都创新互联是一家专注于做网站、网站建设与策划设计,景洪网站建设哪家好?成都创新互联做网站,专注于网站建设十余年,网设计领域的专业建站公司;建站业务涵盖:景洪等地区。景洪做网站价格咨询:028-86922220

Python去掉标点符号的方法如下:

方法一:

str.isalnum:

S.isalnum() -> bool

返回值:如果string至少有一个字符并且所有字符都是字母或数字则返回True,否则返回False。

实例:

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

只能识别字母和数字,杀伤力大,会把中文、空格之类的也干掉

方法二:

string.punctuation

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)

方法三:

re

例:

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

测试:

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

关于python中去除标点符号的方法就分享到这里了,希望以上内容可以对大家有一定的帮助,可以学到更多知识。如果觉得文章不错,可以把它分享出去让更多的人看到。

另外有需要云服务器可以了解下创新互联scvps.cn,海内外云服务器15元起步,三天无理由+7*72小时售后在线,公司持有idc许可证,提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案,具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势,专为企业上云打造定制,能够满足用户丰富、多元化的应用场景需求。


分享文章:python中去除标点符号的方法-创新互联
网页地址:http://hbruida.cn/article/dhgidj.html