Python TypeError must be str not int

I am having trouble with the following piece of code:
我对下列代码有一些问题

 if verb == "stoke":

        if items["furnace"] >= 1:
            print("going to stoke the furnace")

            if items["coal"] >= 1:
                print("successful!")
                temperature += 250 
                print("the furnace is now " + (temperature) + "degrees!")
                           ^this line is where the issue is occuring
            else:
                print("you can't")

        else:
            print("you have nothing to stoke")

The resulting error comes up as the following:
结果报错如下

Traceback(most recent call last):
       File "C:UsersUserdocumentsPythonsmelting game 0.3.1 build 
       incomplete.py"
     , line 227, in 
         print("the furnace is now " + (temperature) + "degrees!")
    TypeError: must be str, not int

回答：

print("the furnace is now " + str(temperature) + "degrees!")

cast it to str
使用str转换int格式到str