在Python 3.x中，可以使用nonlocal关键字：
def outer():
string = ""
def inner():
nonlocal string
string = "String was changed by a nested function!"
inner()
return string
在Python 2.x中，您可以使用带有单个元素的列表并覆盖该单个元素：
def outer():
string = [""]
def inner():
string[0] = "String was changed by a nested function!"
inner()
return string[0]
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