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    #Èç¹ûΪ¿Õ£¬Ôòʲô¶¼²»×ö
    if not L:
        return
    #Èç¹ûÊÇÁ´±í£¬Ôò¶ÔµÚÒ»¸öÔªËØµ÷ÓÃprintListº¯Êý
    if type(L[0])==type([]):
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        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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example of python operator overloadind

And last here is the overload operators example:
# map() takes two (or more) arguments, a function and a list to apply the function to
# lambda can be put anywhere a function is expected
# map() calls lambada for every element in the self list
# since Vector has overloaded __getitem__ and __len_ ......

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random() Return the next random floating point number in the range [0.0, 1.0). 
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N <= b
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