gistfile1.py

# This works
def isWordIn(word, text):
        for sign in string.punctuation:
            if (sign in text):
                text = text.replace(sign, '')
                print(text)
        words = (text.lower()).split()
        print(words)
        return word in words

isWordIn('ciao', 'Ciao, come stai')
Ciao come stai
['ciao', 'come', 'stai']
True

ps6.py

# This fails

class WordTrigger(Trigger):
    """Abstract class for word triggers"""
    def __init__(self, word):
        self.word = word

    def isWordIn(self, text):
            for sign in string.punctuation:
                if (sign in text):
                    text = text.replace(sign, '')
            words = (text.lower()).split()
            return self.word in words