函数的作用域在它定义阶段就已经确定了

def tell_info(name):
    print("%s have %s" %(name, money))

def foo():
    money = 100
    tell_info("andy")

foo()

Traceback (most recent call last):
  File "D:/Coding/oldboy/测试.py", line 86, in <module>
    foo()
  File "D:/Coding/oldboy/测试.py", line 83, in foo
    tell_info("andy")
  File "D:/Coding/oldboy/测试.py", line 79, in tell_info
    print("%s have %s" %(name, money))
NameError: name 'money' is not defined

函数的作用域关系在定义阶段就已经确定，与调用位置无关，无论函数在何处调用，都需要回到定义阶段去找对应的作用域关系，上面的例子中tell_info虽然在foo中调用，但它仍会回到tell_info中查找对应作用域关系，tell_info中没有局部money，也没有全局的变量，所以报错.