Question

我从一本名为Hello World 2nd Edition的书中学习。

在第14章第171页我必须写一个程序。这就是我写的：

class HotDog:
    def __init__(self):
        self.cooked_level = 0
        self.cooked_string = "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_level = "Medium"
        else:
            self.cooked_string = "raw"
    def addCondiemnet(self, condiment):
        self.condiments.append(condiment)

myDog = HotDog()
print myDog
print "Cooking my Hot Dog for 4 minutes...."
myDog.cook(4)
print myDog
print "Cooking 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, im going to add some stuff to my hot dog"
myDog.addComdiment("ketchup")
myDog.addComdiment("More ketchup")
myDog.addComdiment("AND More ketchup")
print myDog

如果我运行它，我会收到错误消息：

Traceback (most recent call last):
  File "C:\Users\Jay\Desktop\Python Programs\Chapter 1\AdvancedHOTDOG.py", line 34, in <module>
    myDog.cook(3)
  File "C:\Users\Jay\Desktop\Python Programs\Chapter 1\AdvancedHOTDOG.py", line 16, in cook
    self.cooked_level=self.cooked_level+time
TypeError: cannot concatenate 'str' and 'int' objects

如果您知道问题，请回复。

Answer 1

问题在于第22行：

self.cooked_level = "Medium"

您正在为self.cook_level分配一个字符串。

该行应该是：

 self.cooked_string = "Medium"

Python错误TypeError：无法连接＆＃39; str＆＃39;和＆＃39; int＆＃39;对象

1 个答案: