#父与子的编程之旅
#与小卡特一起学Python
#第十四课一
#终于到了对象这一章节，集前面学习的大成，尝试着一点一点的理解每行代码的意义，在大脑中模拟运算整个代码可能出现的结果。
#然后打开电脑，按照教材的代码清单，逐个字母的敲击进去。
#不积跬步无以至千里，你要默默努力，悄悄生长，然后惊艳所有人。
#加油，你是最棒的。
#代码1—创建一个对象
class Ball:
def bounce(self):
if self.direction == "down":
self.direction = "up"
myBall = Ball()
myBall.direction = "down"
myBall.color = "red"
myBall.size = "small"
print ("I just created a ball.")
print ("My ball is ",myBall.size)
print ("My ball is ",myBall.color)
print ("My ball`s direction is ", myBall.direction)
print ("Now i`m going to bounce the ball.")
print()
myBall.bounce()
print ("Now the ball`s direction is ",myBall.direction)
print()
#代码2—初始化一个对象，让对象在使用之前处于预设的状态
class Ball:
def __init__(self,color,size,direction):
self.color=color
self.size=size
self.direction=direction
def bounce(self):
if self.direction=="down":
self.direction="up"
myBall=Ball("red","small","down")
print("I just created a ball.")
print ("My ball is ",myBall.size)
print("My ball is", myBall.color)
print("My ball`s direction is ", myBall.direction)
print("Now I`m going to bounce the ball")
print()
myBall.bounce()
print ("Now the ball`s direction is", myBall.direction)
print(myBall)
print()
#代码3,—使用str（）方法来改变打印对象的方式
class Ball:
def __init__(self, color, size, direction):
self.color = color
self.size = size
self.direction = direction
def __str__(self):
msg = "Hi, I`m a " self.size " " self.color " " " ball!"
return msg
myBall = Ball("red","small","down")
print (myBall)
#代码4—加热热狗，并添加配料
#学习了这么久之后，第一次编写一个有头有尾的程序，从定义类别开始，到完成配料添加
#对于变成的理解，和程序员的思想，也有了进一步的体会
#看着教材的内容，自己演练演练
#好记性不如烂笔头，看的再仔细，不如自己在键盘上多敲敲
class HotDog:
def __init__(self):
self.cooked_level = 0
self.cooked_srting = "Raw"
self.condiments = []
def __str__(self):
msg= "hot dog"
if len(self.condiments) >0:
msg= msg " with"
for i in self.condiments:
msg= msg i ", "
msg = msg.strip(", ")
msg = self.cooked_string " " msg "."
return msg
def cook(self, time):
self.cooked_level = self.cooked_level time
if self.cooked_level > 8:
self.cooked_string = "Charcoal"
elif self.cooked_level > 5:
self.cooked_string = "Well-done"
elif self.cooked_level > 3:
self.cooked_string = "Medium"
else:
self.cooked_string = "Raw"
def addCondiment (self, condiment):
self.condiments.append (condiment)
myDog = HotDog()
print(myDog)
print ("Cooking hot dog for 4 minutes...")
myDog.cook(4)
print (myDog)
print ("Cookding hot dog for 3 more minutes...")
myDog.cook(3)
print (myDog)
print ("What happens if I cook it for 10 more minutes?")
myDog.cook(10)
print (myDog)
print ("Now, I`m going to add some stuff on my hot dog.")
myDog.addCondiment ("ketchup")
myDog.addCondiment ("mustard")
print (myDog)
print ()
最后的这个代码，无法运行，提示错误，但是我和标准答案比较之后没有错误，谁能发现错在什么地方了吗？
