def scope_test():
def do_local():
spam = "local spam"
def do_nonlocal():
nonlocal spam
spam = "nonlocal spam"
def do_global():
global spam
spam = "global spam"#spam虽然声明了global但此处仍是函数内的局部变量
spam = "test spam"
do_local()
print("After local assignment: ",spam)#"test spam"
do_nonlocal()
print("After nonlocal assignment: ",spam)# "nonlocal spam"
do_global()
print("After global assignment: ",spam)# scope_test()
print("In global scope: ",spam)#do_global函数会自己定义一个全局变量spam，即使没有预先定义的全局变量
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