local variable 'xxx'referenced before assignment

【求助】local variable 'xxx'referenced before assignment

Python code

def a(): test={'a':123,'b':456}for item in test:　if item.name == 'a':　　xxx=item.name+'='+item.valuea=xxxdef b()……

Python code

# python version:3.2# -*- coding:gbk -*-test = {'a':123, 'b':456}for item in test:    if item == 'a':        xxx = item + '=' + str(test[item])
[解决办法]
Python code
def a():    test = {'a':123,'b':456}    for item in test:        if item == 'a':            xxx = item + '=' + str(test[item])            return xxx
[解决办法]
很明显的变量作用域的问题啊。。。
def a():  
test={'a':123,'b':456}
xxx = None
for item in test:
　if item.name == 'a':
　　xxx=item.name+'='+item.value
a=xxx
def b()
……