Python全局行为异常

Question

以下内容打印出“无”而不是“任何内容”。我不明白为什么。

dirr = None

def method():
    global dirr # you have to declare that you'll use global variable 'dirr'
    dirr = "whatever"

print `dirr`

Answer 1

您应该一次调用“方法”。

dirr = None

def method():
    global dirr # you have to declare that you'll use global variable 'dirr'
    dirr = "whatever"

method()
print (dirr)

结果是：

whatever