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How to implement simple text string processing in Python

不言
不言Original
2018-05-04 15:42:261529browse

这篇文章主要介绍了Python实现简单文本字符串处理的方法,涉及Python针对文本字符串的切割、计算、转换等相关操作技巧,需要的朋友可以参考下

本文实例讲述了Python实现简单文本字符串处理的方法。分享给大家供大家参考,具体如下:

对于一个文本字符串,可以使用Python的string.split()方法将其切割。下面看看实际运行效果。

mySent = 'This book is the best book on python!'
print mySent.split()

输出:

['This', 'book', 'is', 'the', 'best', 'book', 'on', 'python!']

可以看到,切分的效果不错,但是标点符号也被当成了词,可以使用正则表达式来处理,其中分隔符是除单词、数字外的任意字符串。

import re
reg = re.compile('\\W*')
mySent = 'This book is the best book on python!'
listof = reg.split(mySent)
print listof

输出为:

['This', 'book', 'is', 'the', 'best', 'book', 'on', 'python', '']

现在得到了一系列词组成的词表,但是里面的空字符串需要去掉。

可以计算每个字符串的长度,只返回大于0的字符串。

import re
reg = re.compile('\\W*')
mySent = 'This book is the best book on python!'
listof = reg.split(mySent)
new_list = [tok for tok in listof if len(tok)>0]
print new_list

输出为:

['This', 'book', 'is', 'the', 'best', 'book', 'on', 'python']

最后,发现句子中的第一个字母是大写的。我们需要同一形式,把大写转化为小写。Python内嵌的方法,可以将字符串全部转化为小写(.lower())或大写(.upper())

import re
reg = re.compile('\\W*')
mySent = 'This book is the best book on python!'
listof = reg.split(mySent)
new_list = [tok.lower() for tok in listof if len(tok)>0]
print new_list

输出为:

['This', 'book', 'is', 'the', 'best', 'book', 'on', 'python']

下面来看一封完整的电子邮件:

内容

Hi Peter,

With Jose out of town, do you want to
meet once in a while to keep things
going and do some interesting stuff?

Let me know
Eugene

import re
reg = re.compile('\\W*')
email = open('email.txt').read()
list = reg.split(email)
new_txt = [tok.lower() for tok in list if len(tok)>0]
print new_txt

输出:

复制代码 代码如下:

['hi', 'peter', 'with', 'jose', 'out', 'of', 'town', 'do', 'you', 'want', 'to', 'meet', 'once', 'in', 'a', 'while', 'to', 'keep', 'things', 'going', 'and', 'do', 'some', 'interesting', 'stuff', 'let', 'me', 'know', 'eugene']

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