你可以使用替换和列表解析。

list_with_quotes = [['"MILK,BREAD,BISCUIT"'], ['"BREAD,MILK,BISCUIT,CORNFLAKES"']]
list_without_quotes = [[l[0].replace('"','')] for l in list_with_quotes]
print(list_without_quotes)
>>out
>>[['MILK,BREAD,BISCUIT'], ['BREAD,MILK,BISCUIT,CORNFLAKES']]

抱歉，我做得很快，没有注意到我的输出并不完全是你想要的。下面是一个for循环，可以完成这项工作：

list_without_quotes = []
for l in list_with_quotes:
    # get list
    with_quotes = l[0]
    # separate words by adding spaces before and after comma to use split
    separated_words = with_quotes.replace(","," ")
    # remove quotes in each word and recreate list
    words = [ w.replace('"','') for w in separated_words.split()]
    # append list to final list
    list_without_quotes.append(words)
print(list_without_quotes)
>>out
>>[['MILK', 'BREAD', 'BISCUIT'], ['BREAD', 'MILK', 'BISCUIT', 'CORNFLAKES']]

尝试使用列表解析：

initial = [['"MILK,BREAD,BISCUIT"'], ['"BREAD,MILK,BISCUIT,CORNFLAKES"']]

final = [item[0].replace('"', '').split(',') for item in initial]

print(final)

输出：

[['MILK', 'BREAD', 'BISCUIT'], ['BREAD', 'MILK', 'BISCUIT', 'CORNFLAKES']]