OOP Dr.House Chat bot

#============= OOP Dr.House Chat bot =============#
import re as searcher
def findMaxIndex(array_):
    maxNum = 0
    index = 0
    for i in range(len(array_)):
        if array_[i] > maxNum:
            maxNum = array_[i]
            index = i
    return index
class ChatBot:
    def __init__(self, question):
        self.question = question
        file = open("ans.txt",'r')
        self.memory = file.read()
        self.rightAnswer =""
    def searchContent(self, mem, keyword):
        result = searcher.search(keyword, mem)
        if result is not None:
            return True
        return False
    def searchForAnswerInMemory(self):
        questionsArray = self.question.split(" ")
        rightCaseCount = []
        memSplit = self.memory.split(".")
        for mem in memSplit:
            add = 0
            for part in questionsArray:
                if self.searchContent(mem, part) == True:
                    add += 1
            rightCaseCount.append(add)

        return rightCaseCount
    def mainChat(self):
        catcher = self.searchForAnswerInMemory()
        maxIndex = findMaxIndex(catcher)
        maxValue = max(catcher)
        print(catcher) #DeBUGGING
        if maxValue <= 2:
            print("Sry I have nothing for you !")
            answer = input("give me the answer -> ")
            file = open("ans.txt", 'a')
            file.write(answer)
        else:
            memSplit = self.memory.split(".")
            print(memSplit[maxIndex])

#================= Main ==============#
ques = "WELCOME"
while True:
    ques = input("Question ->")
    if ques == "quit":
        break
    x = ChatBot(ques)
    x.mainChat()