class Trigger(object):
    def evaluate(self, story):
        """
        Returns True if an alert should be generated
        for the given news item, or False otherwise.
        """
        raise NotImplementedError

# Whole Word Triggers
# Problems 2-5

def nopun(story):
    for x in string.punctuation:
        story.replace(x,' ')
    return story

class WordTrigger(Trigger):
    def __init__(self,word):
        self.word = word

    def isWordIn(self,text):
        return self.word.lower() in nopun(text).lower()

class TitleTrigger(WordTrigger):
    pass
class SubjectTrigger(WordTrigger):
    pass

class SummaryTrigger(WordTrigger):
    pass