doctor.py

import random

class Doctor():

    QUALIFIERS = ['Why do you say that ', 'You seem to think that ',
                  'Did I just hear you say that ', 'Why do you believe that ' ]

    REPLACEMENTS = {'I': 'you', 'me': 'you', 'my': 'your',
                    'we': 'you', 'us': 'you', 'am': 'are',
                    'you': 'I', 'You': 'I'}

    HEDGES = ['Go on.', 'I would like to hear more about that.',
              'And what do you think about this?', 'Please continue.']

    def __init__(self):
        self.history = []

    def greeting(self):
        return 'Good morning, how can I help you today?'

    def farewell(self):
        return 'Have a nice day!'

    def reply(self, sentence):
        choice = random.randint (1, 10)
        if choice == 1:
            if len(self.history) > 3:
                answer = 'Earlier you said that ' + \
                self.change_person(random.choice(self.history))
            else:
                answer = random.choice(Doctor.HEDGES)
        elif choice in (2,3,4,5):
            answer = random.choice(Doctor.QUALIFIERS) + \
            self.change_person(sentence)
        else:
            answer = random.choice(Doctor.HEDGES)
        self.history.append(sentence)
        return answer
        
    def change_person(self, sentence):
        oldlist = sentence.split()
        newlist = []
        for word in oldlist:
            if word in Doctor.REPLACEMENTS:
                newlist.append(Doctor.REPLACEMENTS[word])
            else:
                newlist.append(word)
        return " ".join(newlist)