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    #Èç¹ûΪ¿Õ£¬Ôòʲô¶¼²»×ö
    if not L:
        return
    #Èç¹ûÊÇÁ´±í£¬Ôò¶ÔµÚÒ»¸öÔªËص÷ÓÃprintListº¯Êý
    if type(L[0])==type([]):
        printList(L[0])
    else:#Èç¹û²»ÊÇÁ´±í£¬½öÊä³öÔªËؼ´¿É
        print L[0]
    #´¦ÀíLµÄÆäËû²¿·Ö
    printList(L[1:]) >>> aList=['a',['b','c',['d','e']],'f',[],'g']
>>> printList(aList)
a
b
c
d
e
f
g
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