类方法调用报错，菜鸟请教

类定义：
class AnnoymousSurvey():

#define a class which collect answers of surveys

def __init__(self,question):
    self.question=question
    self.responses=[]

def show_question(self,question):
    print(question)

def store_question(self,new_response):
    self.responses.append(new_response)

def show_results(self):
    print("Survey results:")
    for response in responses:
        print(response)

类方法调用：
from survey import AnnoymousSurvey

question='which animal do you like ?'
mysurvey=AnnoymousSurvey(question)

mysurvey.show_question(question)

print('enter q to quit')

while True:

response=input('Animal:')
if response.lower()=='q':
    break
mysurvey.store_question(response)

mysurvey.show_results() --->这一步会报错：

Survey results:
Traceback (most recent call last):
File "language.py", line 16, in

mysurvey.show_results()    

File "E:python_codesurvey.py", line 16, in show_results

for response in responses:

NameError: name 'responses' is not defined