Python 错误 : local variable referenced before assignment

Question

这是我的代码:

import time

GLO = time.time()

def Test():
    print GLO
    temp = time.time();
    print temp
    GLO = temp

Test()

Traceback (most recent call last): File "test.py", line 11, in Test() File "test.py", line 6, in Test print GLO UnboundLocalError: local variable 'GLO' referenced before assignment

在添加GLO = temp时出现错误，如果我注释掉，函数可以执行成功，为什么？

如何设置 GLO = temp？

Answer 1

在测试方法中指定您要引用全局声明的 GLO 变量，如下所示

def Test():
    global GLO #tell python that you are refering to the global variable GLO declared earlier.
    print GLO
    temp = time.time();
    print temp
    GLO = temp

可以在这里找到类似的问题: Using a global variable within a method