编辑字符串，Python

Question

免责声明：对python来说非常新鲜。我有一个作业，要求我在去掉标点符号并将文件中所有单词小写后，计算并打印文件中每个单词的频率（连同单词一起）。现在，我有以下输入组合来处理文件中的每一行：

import string

words = "Dave, Laura, Maddy, Dave, Laura, Maddy, Dave, Laura, Dave"
translation = str.maketrans("","", string.punctuation)
new = words.translate(translation)
lower = new.lower()

然而，这对我来说似乎很粗糙，我觉得我可以用更少的函数调用/更少的代码来完成我的任务。有人对我怎么做有什么建议吗？在

Answer 1

words = "Dave, Laura, Maddy, Dave, Laura, Maddy, Dave, Laura, Dave"
words_lower = ' '.join([word.lower() for word in words.split(',')])
print (words_lower)


dave  laura  maddy  dave  laura  maddy  dave  laura  dave

Answer 2

如果你想计算每个单词的频率，你可以试试这个：

>>> from collections import Counter
>>> words = "Dave, Laura, Maddy, Dave, Laura, Maddy, Dave, Laura, Dave"
>>> Counter([word.lower() for word in words.split(', ')])
Counter({'dave': 4, 'laura': 3, 'maddy': 2})

^{}的文档

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第一个答案的简短备选方案：

^{pr2}$

如果你想去掉标点符号（多于“，”）：

>>> import re
>>> words = "Dave! Laura: Maddy; Dave, Laura? Maddy, Dave, Laura, Dave."
>>> re.sub(r'[!:;,?.]', '', words).lower()
'dave laura maddy dave laura maddy dave laura dave'