TypeError: unsupported operand type(s) for +: 'int' and 'str'

1、错误描述

>>> import time;
>>> di={1:'A',2:'B'};
>>> for key,value in dict.items(di):
	print(key+","+value);
	time.sleep(2);

	
Traceback (most recent call last):
  File "<pyshell#5>", line 2, in <module>
    print(key+","+value);
TypeError: unsupported operand type(s) for +: 'int' and 'str'
>>> 

2、错误原因

      在打印key和value时，key是int类型，value是str类型，直接利用逗号将它们连接起来会报错

3、解决办法

     将key转换成字符串，然后再跟value连接起来打印

print(str(key)+","+value);