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雖然聲明了global但此處仍是函數內的局部變量
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函數會自己定義一個全局變量spam，即使沒有預先定義的全局變量
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