July 2019
Intermediate to advanced
365 pages
8h 13m
Chinese
Content preview from Python机器学习手册：从数据预处理到深度学习
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100
｜
第
6
章
处理文本
本书不会对
Beautiful Soup
操作进行全面介绍，这超出了本书的范围。从上述解决方案
可以看出，用它解析
HTML
代码并提取想要的数据非常简单。
延伸阅读
y
Beautiful Soup
（
http://bit.ly/2pwZcYs
）
6.3
移除标点
问题描述
移除文本数据的特征中的标点。
解决方案
定义一个函数，将一个标点字典作为参数传入
translate
：
#
加载库
import unicodedata
import sys
#
创建文本
text_data = ['Hi!!!! I. Love. This. Song....',
'10000% Agree!!!! #LoveIT',
'Right?!?!']
#
创建一个标点字典
punctuation = dict.fromkeys(i for i in range(sys.maxunicode)
if unicodedata.category(chr(i)).startswith('P'))
#
移除每个字符串中的标点
[string.translate(punctuation) for string in text_data]
['Hi I Love This Song', '10000 Agree LoveIT', 'Right']
讨论
translate
因其非凡的性能成为
Python
中非常流行的函数。上述解决方案先创建一个
punctuation
字典，将
Unicode
中的标点字符作为 ...
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