如何从python中的字符串列表中去除多个不需要的字符？

Question

I have the following input string:

text='''Although never is often better than *right* now.

If the implementation is hard to explain, it's a bad idea.

If the implementation is easy to explain, it may be a good idea.

Namespaces are one honking great idea -- let's do more of those!'''

So far, I have split the text string into a list like so:

list=['Although', 'never', 'is', 'often', 'better', 'than', '*right*', 'now.\n\nIf', 'the', 'implementation', 'is', 'hard', 'to', 'explain,', "it's", 'a', 'bad', 'idea.\n\nIf', 'the', 'implementation', 'is', 'easy', 'to', 'explain,', 'it', 'may', 'be', 'a', 'good', 'idea.\n\nNamespaces', 'are', 'one', 'honking', 'great','idea', '--', "let's", 'do', 'more', 'of', 'those!']

Now, I want to use strip function to remove unwanted characters such as \\n\\n and -- from the above list.

Can You please help me on this??

Answer 1

Use re module, re.sub function will allow you to do that. We need to replace multilpe \\n occurences with single \\n and remove -- string

import re

code='''Although never is often better than right now.

If the implementation is hard to explain, it's a bad idea.

If the implementation is easy to explain, it may be a good idea.

Namespaces are one honking great idea -- let's do more of those!'''


result = re.sub('\n{2,}', '\n', code)
result = re.sub(' -- ', ' ', result)

print(result)

After that split() your text.

Answer 2

This will split the string with either space or newline character

import re

output = [i for i in re.split(r'\s|\n{1:2}|--', code) if i]

Answer 3

You can use list comprehension to get rid of --

>>> code='''Although never is often better than right now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!'''
>>> 
>>> [word for word in code.split() if word != '--']
['Although', 'never', 'is', 'often', 'better', 'than', 'right', 'now.', 'If', 'the', 'implementation', 'is', 'hard', 'to', 'explain,', "it's", 'a', 'bad', 'idea.', 'If', 'the', 'implementation', 'is', 'easy', 'to', 'explain,', 'it', 'may', 'be', 'a', 'good', 'idea.', 'Namespaces', 'are', 'one', 'honking', 'great', 'idea', "let's", 'do', 'more', 'of', 'those!']