"当我尝试从列表中删除变量时，remove() 返回 None"

Question

I am working on a part of a program that turns a statement into a question.

def Ask(Question):
    Auxiliary = ("will", "might", "would", "do", "were", "are", "did")
    for x in Auxiliary:
        if x in Question:
            Question_l = Question.lower()
            Question_tk_l = word_tokenize(Question)
            Aux_Rem = Question_tk_l.remove(x)
            print (Aux_Rem)

Answer 1

That's correct behaviour. remove removes that element and doesn't return a value (ie returns None ). You can use pop if you wish to access the removed element.

Answer 2

somelist.remove(x) removes the first element it finds that equals x from somelist . It doesn't return the modified list. To print the modified list, simply print the list.

print(Question_tk_l)

If you want to turn it into a nice string, you should join it with space.

print(' '.join(Question_tk_l))

Answer 3

You were very very nearly right. You dont need to create a new variable for the modified list. You can just do:

def Ask(Question): 
    Auxiliary = ("will", "might", "would", "do", "were", "are", "did") 
    for x in Auxiliary: 
        if x in Question:
            Question_l = Question.lower() 
            Question_tk_l = word_tokenize(Question) 
            Question_tk_l.remove(x) 
            print (Question_tk_l)