How do you store a list of strings in a function?

sentence = input("Input sentence: ")
punctuation = [" ", ",", ".", ":", "?", "!"]
interruption1 = sentence.index(punctuation)
word1 = sentence[:interruption1]
print(word1)

In this question, the main aim is to have the program print the first word that the user types by identifying a character that implies the first word has ended (the punctuation characters in the ‘punctuation’ variable). I want the program to accept the ‘punctuation’ variable within the index function but it sends an error message saying "must be str, not list". I tried for loops, they don’t work here either as far as I know.

A previous question of mine gave me information that you can’t use boolean values to represent a set of values in a variable, so I used a list, but now this error happens, and there is absolutely nothing on the Internet on this sort of problem (neither do I have an IT teacher or any friends that do Python), so I had to come here after about an hour of trying random combinations of code. How do I make Python accept the list and use it inside the index function? Thank you.

>Solution :

You don’t need to use an index unless it is demanded; just keep accepting characters from the sentence until you come to a punctuation. So the simplest looping approach is:

sentence = input("Input sentence: ")

punctuation = [" ", ",", ".", ":", "?", "!"]

result = ""
for c in sentence:
    if c in punctuation:
        break
    else:
        result = result + c

print(result)