请参见下面的代码:可变全局变量不会隐藏在python函数中,对吧?
def good():
foo[0] = 9 # why this foo isn't local variable who hides the global one
def bad():
foo = [9, 2, 3] # foo is local, who hides the global one
for func in [good, bad]:
foo = [1,2,3]
print('Before "{}": {}'.format(func.__name__, foo))
func()
print('After "{}": {}'.format(func.__name__, foo))
结果如下:
# python3 foo.py
Before "good": [1, 2, 3]
After "good": [9, 2, 3]
Before "bad" : [1, 2, 3]
After "bad" : [1, 2, 3]
我想你是对的。没有设置,没有新的名字。 – aXqd 2010-05-07 03:20:45
我想是这样,但为什么不同的设置和使用之间的逻辑?如果一切顺利,你还必须申报全球foo,是不是更加一致,并防止用户拍摄自己的脚? – liang 2013-09-19 11:50:05