计数python中的单词类

Question

I want to create a class which has a function to count the words in a string which is passed through the function as a parameter (is my terminology correct?). This is what I have an it gives me an error "AttributeError: 'str' object has no attribute 'sentence'.

class myHacks:
    def __init__(self, sentence):
        self.sentence = sentence

    def countWords(self):
        my_list = []
        my_list = self.sentence.split(" ")
        counter = 0
        for m in my_list:
            counter += 1
        return counter

myHacks.countWords("please count me")

Answer 1

You are mixing the class instantiation with the method call, you should instantiate a class with the correct string

h = myHacks("please count me")

and then call the countWords method on the new object

h.countWords()

Answer 2

It sounds like what you need is just a function, not a class. Classes have to be instantiated, and are used when you need to do more than just one operation on a related set of data. For your single use case, a function will probably suffice:

def countWords(sentence):
    my_list = []
    counter = 0
    for s in sentence:
        counter += 1
    return(counter)

Also, you never use my_list , and you're counting letters in that sentence, not words. This is probably what you need instead:

def countWords(sentence):
    return len(sentence.split())

In order to use your method, with a class, like you've written, you'd have to call it this way:

hacks = myHacks('this is my sentence')
hacks.countWords()