我正在开发一个涉及游戏的程序，该程序将根据用户输入更改笑脸(使用乌龟绘制)。 程序启动时，将绘制一张规则的笑脸(黄色的脸，黑色的眼睛和嘴巴，微笑)。 然后，通过以下菜单提示用户更改面孔：

换脸

1)让我皱眉

2)让我生气

3)让我的眼睛变蓝

0)退出

输入选择：

如果用户选择1，则将笑脸重新绘制，皱眉变成微笑，菜单将更改为：

换脸

1)让我微笑

2)让我生气

3)让我的眼睛变蓝

0)退出

输入选择：

如果用户选择2，将重新绘制笑脸并用皱眉填充红色，菜单将更改为：

换脸

1)让我微笑

2)让我开心

3)让我的眼睛变蓝

0)退出

输入选择：

我很难根据用户输入更改笑脸。 我该如何改变笑脸？

据我所知，请帮助！：

import turtle

turtle.up()

turtle.goto(0, -100) # center circle around origin

turtle.down()

turtle.begin_fill()

turtle.fillcolor("yellow") # draw head

turtle.circle(100)

turtle.end_fill()

turtle.up()

turtle.goto(-67, -40)

turtle.setheading(-60)

turtle.width(5)

turtle.down()

turtle.circle(80, 120) # draw smile

turtle.fillcolor("black")

for i in range(-35, 105, 70):

turtle.up()

turtle.goto(i, 35)

turtle.setheading(0)

turtle.down()

turtle.begin_fill()

turtle.circle(10) # draw eyes

turtle.end_fill()

class Face:

def __init__(self):

self.__smile = True

self.__happy = True

self.__dark_eyes = True

def draw_face(self):

turtle.clear()

self.__draw_head()

self.__draw_eyes()

self.__draw_mouth()

def is_smile(self):

self.__smile = False

def is_happy(self):

self.__happy = False

def is_dark_eyes(self):

self.__dark_eyes = False

def __draw_head(self):

self.__draw_head

def __draw_eyes(self):

self.__draw_eyes

def __draw_mouth(self):

self.__draw_mouth

def change_mouth(self):

self.__smile = not self.__smile

self.draw_face()

def change_emotion(self):

self.__happy = not self.__happy

self.draw_face()

def change_eyes(self):

self.__dark_eyes = not self.__dark_eyes

self.draw_face()

def main():

face = Face()

face.draw_face()

done = False

while not done:

print("Change My Face")

mouth = "frown" if face.is_smile() else "smile"

emotion = "angry" if face.is_happy() else "happy"

eyes = "blue" if face.is_dark_eyes() else "black"

print("1) Make me", mouth)

print("2) Make me", emotion)

print("3) Make my eyes", eyes)

print("0) Quit")

menu = int(input("Enter a selection: "))

if menu == 1:

face.change_mouth()

face.draw_face()

elif menu == 2:

face.change_emotion()

face.draw_face()

elif menu == 3:

face.change_eyes()

face.draw_face()

else:

break

print("Thanks for Playing")

turtle.hideturtle()

turtle.done()

main()

如何实现乌龟代码，以便可以根据用户输入绘制笑脸？