python基础操作---list
1 #coding:utf-8 2 list1 = ['physics', 'chemistry', 1997, 2000]; 3 list2 = [1, 2, 3, 4, 5 ]; 4 list3 = ["a", "b", "c", "d"]; 5 6 #切片功能跟str一样 7 print "list1[0]: ", list1[0] 8 print "list2[1:5]: ", list2[1:5] 9 print list1[::-1] 10 list3.append("e")# 追加 11 print list3 12 13 del list1[2]; 14 print list1; 15 16 list4 = list2 + list3 17 18 print list4 19 20 print 3 in list2 21 22 for item in list2: 23 print item 24 25 #等价 26 # for i in range(len(list2)): 27 # print list2[i] 28 29 # list_2d = [[0 for col in range(cols)] for row in range(rows)] 30 list_2d = [ [0 for i in range(5)] for i in range(4)] #2维数据, 0为初始化数值 31 32 print list_2d 33 list_2d[0][1]=1 34 print list_2d
输出----------------------------------------------------
list1[0]: physics
list2[1:5]: [2, 3, 4, 5]
[2000, 1997, 'chemistry', 'physics']
['a', 'b', 'c', 'd', 'e']
['physics', 'chemistry', 2000]
[1, 2, 3, 4, 5, 'a', 'b', 'c', 'd', 'e']
True
1
2
3
4
5
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
[[0, 1, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
