python-zip、enumerate

zip

构造新列表

eg：L1 = [1,2,3]

        L2 = [4,5,6]

       list(zip(L1,L2)) = [(1,4),(2,5),(3,6)]

当参数长度不同是，会以最短序列的长度为准截断序列

构造字典

L1=['d','f','g']

 L2 = [4,5,6]

dict(zip(L1,L2)) = {'d':4,'f':5,'g':6}

enumerate//产生偏移与元素

s = 'spam'

for(offset,itrm) in enumerate(s):

            print(offset,iem)

--->0.s

        1,p

        2,a

        3,m