如何从列表中的字符串末尾去除特定标点符号并使所有单词小写

Question

I have a list of strings and need certain punctuation stripped off the end of each string within the list. The list is like:

list = ['Twas', 'brillig,', 'and', 'the', 'slithy', 'toves', 'Did', 'gyre',
        'and', 'gimble', 'in', 'the', 'wabe:']  #the list is a lot longer

I need to strip off all punctuation that includes '"-,.:;?? only from the end of each string and make all words lower case.

Io I need 'Twas' to become 'twas' and I need 'wabe:' to become 'wabe' , etc... other words in the list that i did not include here contain the other punctuation at the end.

I tried using .rstrip() and .lower() case but I did not know how to use a for or while loop to go through each string in the list and do this. If there is another way that does not need to use .rstrip or .lower I am open to them.

I am a beginner with using python so the very basic answer would help me and if you could explain exactly what you do, it would be greatly appreciated.

Answer 1

>>> [el.lower().rstrip('\'\"-,.:;!?') for el in list]
['twas', 'brillig', 'and', 'the', 'slithy', 'toves', 'did', 'gyre', 'and', 'gimble', 'in', 'the', 'wabe']

This is a list comprehension, which is a one line way of writing a for loop which produces a list. It iterates through the list item by item, setting each element to lowercase, and then stripping trailing characters '"-,.:;??