将标点符号从python列表中删除

Question

我知道有大量关于删除标点符号的示例，但我想知道执行此操作的最有效方法。我有一个单词列表，我从一个txt文件读取和拆分

wordlist = open('Tyger.txt', 'r').read().split() 

什么是检查每个单词，并删除任何标点的最快方法？我可以用一堆代码来做，但我知道这不是最简单的方法。

谢谢！

Answer 1

我认为最简单的方法是只由字母首先提取词：

import re 

with open("Tyger.txt") as f: 
    words = re.findall("\w+", f.read()) 

Answer 2

例如：

text = """ 
Tyger! Tyger! burning bright 
In the forests of the night, 
What immortal hand or eye 
Could frame thy fearful symmetry? 
""" 
import re 
words = re.findall(r'\w+', text) 

或

import string 
ps = string.punctuation 
words = text.translate(string.maketrans(ps, ' ' * len(ps))).split() 

第二个速度要快得多。

Answer 3

我会去像这样的东西：

import re 
with open("Tyger.txt") as f: 
    print " ".join(re.split("[\-\,\!\?\.]", f.read()) 

它将删除只在真正需要什么，并不会由于过匹配产生过多过载。

Answer 4

>>> import re 

>>> the_tyger 
'\n Tyger! Tyger! burning bright \n In the forests of the night, \n What immortal hand or eye \n Could frame thy fearful symmetry? \n \n In what distant deeps or skies \n Burnt the fire of thine eyes? \n On what wings dare he aspire? \n What the hand dare sieze the fire? \n \n And what shoulder, & what art. \n Could twist the sinews of thy heart? \n And when thy heart began to beat, \n What dread hand? & what dread feet? \n \n What the hammer? what the chain? \n In what furnace was thy brain? \n What the anvil? what dread grasp \n Dare its deadly terrors clasp? \n \n When the stars threw down their spears, \n And watered heaven with their tears, \n Did he smile his work to see? \n Did he who made the Lamb make thee? \n \n Tyger! Tyger! burning bright \n In the forests of the night, \n What immortal hand or eye \n Dare frame thy fearful symmetry? \n ' 

>>> print re.sub(r'["-,!?.]','',the_tyger) 

打印：

Tyger Tyger burning bright 
In the forests of the night 
What immortal hand or eye 
Could frame thy fearful symmetry 

In what distant deeps or skies 
Burnt the fire of thine eyes 
On what wings dare he aspire 
What the hand dare sieze the fire 

And what shoulder what art 
Could twist the sinews of thy heart 
And when thy heart began to beat 
What dread hand what dread feet 

What the hammer what the chain 
In what furnace was thy brain 
What the anvil what dread grasp 
Dare its deadly terrors clasp 

When the stars threw down their spears 
And watered heaven with their tears 
Did he smile his work to see 
Did he who made the Lamb make thee 

Tyger Tyger burning bright 
In the forests of the night 
What immortal hand or eye 
Dare frame thy fearful symmetry 

或者与文件：

>>> with open('tyger.txt', 'r') as WmBlake: 
... print re.sub(r'["-,!?.]','',WmBlake.read()) 

如果你想创建行的列表：

>>> lines=[] 
>>> with open('tyger.txt', 'r') as WmBlake: 
... lines.append(re.sub(r'["-,!?.]','',WmBlake.read()))