Python错误类型错误：无法连接'str'和'int'对象

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我正在从名为Hello World 2nd Edition的书中学习。我不得不写一个程序。这是我写的：Python错误类型错误：无法连接'str'和'int'对象

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，我得到错误信息：

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

如果你知道的问题，那么请回复。

来源

2014-11-23 Hijinxx

该错误信息是明确的，我想。 – vaultah 2014-11-23 11:31:32

你也在'def addCondiemnet（）'中有错字，它应该是'def addCondiment（）'，当你把它叫做myDog.addComdiment（）时，它应该是'myDog.addCondiment（）'。 – 2014-11-23 12:02:59

非常感谢，对您而言可能很明显，我已经编程了一个月，并且无法发现错误。因此，thx为您的输入 – Hijinxx 2014-11-23 12:03:12

的问题是第22行：

self.cooked_level = "Medium"

你分配一个字符串self.cook_level。

该行应该是：

self.cooked_string = "Medium"

来源

2014-11-23 11:34:43

Python错误类型错误：无法连接'str'和'int'对象

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