python基础回顾

list： num = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] # list切片有索引值 num = [i for i in range(1,21)] num[7:12]=[9,99,999] print(num) 如图： d1 = {1,2,3,4,5,6,7} d2 = {2,4,7,8,12} d1[2:4]=[33,55,6

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