【Python操作基础】——序列

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【Python操作基础】系列——序列操作，建议收藏！

该篇文章首先利用Python展示了使用序列类型数据的相关操作，包括索引、切片、迭代、拆包、*运算、通用函数操作实例演示等。

1 支持索引

 运行程序：

myString="123456789"
myString[1]myList=[11,12,13,14,15,16,17,18,19]
myList[1]myTuple=(21,22,23,24,25,26,27,28,29)
myTuple[1]

运行结果：

'2'
12
22

2 支持切片

  运行程序：

myString="123456789"
myString[1:9:2] #步长为2切片myList=[11,12,13,14,15,16,17,18,19]
myList[1:9:2]myTuple=(21,22,23,24,25,26,27,28,29)
myTuple[1:9:2]

运行结果：

'2468'
[12, 14, 16, 18]
(22, 24, 26, 28)

3 支持迭代

  运行程序：

from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"       ##执行多输出
myString="123456789"
for i in myString:print(i,end=" ")myList=[11,12,13,14,15,16,17,18,19]
for i in myList:print(i,end=" ")myTuple=(21,22,23,24,25,26,27,28,29)
for i in myTuple:print(i,end=" ")

运行结果：

1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 

4 支持拆包

  运行程序：

myString="123456789"
a1,a2,a3,a4,a5,a6,a7,a8,a9=myString
a1,a2,a3,a4,a5,a6,a7,a8,a9myList=[11,12,13,14,15,16,17,18,19]
a1,a2,a3,a4,a5,a6,a7,a8,a9=myList
a1,a2,a3,a4,a5,a6,a7,a8,a9myTuple=(21,22,23,24,25,26,27,28,29)
a1,a2,a3,a4,a5,a6,a7,a8,a9=myTuple
a1,a2,a3,a4,a5,a6,a7,a8,a9

运行结果：

('1', '2', '3', '4', '5', '6', '7', '8', '9')
(11, 12, 13, 14, 15, 16, 17, 18, 19)
(21, 22, 23, 24, 25, 26, 27, 28, 29)1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 

5 支持*运算

  运行程序：

myString="123456789"
myString * 3 #重复运算符myList=[11,12,13,14,15,16,17,18,19]
myList * 3myTuple=(21,22,23,24,25,26,27,28,29)
myTuple * 3

运行结果：

'123456789123456789123456789'
[11,12,13,14,15,16,17,18,19,11,12,13,14,15,16,17,18,19,11,12,13,14,15,16,17,18,19]
(21,22,23,24,25,26,27,28,29,21,22,23,24,25,26,27,28,29,21,22,23,24,25,26,27,28,29)

6 通用函数

  运行程序：

myString="123456789"
myList=[11,12,13,14,15,16,17,18,19]
myTuple=(21,22,23,24,25,26,27,28,29)
len(myString),len(myList),len(myTuple)sorted(myString),sorted(myList),sorted(myTuple)
(['1', '2', '3', '4', '5', '6', '7', '8', '9'],[11, 12, 13, 14, 15, 16, 17, 18, 19],[21, 22, 23, 24, 25, 26, 27, 28, 29])
reversed(myString),reversed(myList),reversed(myTuple)#生成迭代器list(reversed(myString)) #强制转换值enumerate(myString),enumerate(myList),enumerate(myTuple)
list(enumerate(myString))
[(0, '1'),(1, '2'),(2, '3'),(3, '4'),(4, '5'),(5, '6'),(6, '7'),(7, '8'),(8, '9')]
zip(myList,myTuple)list(zip(myList,myTuple))

运行结果：

(9, 9, 9)
(['1', '2', '3', '4', '5', '6', '7', '8', '9'],[11, 12, 13, 14, 15, 16, 17, 18, 19],[21, 22, 23, 24, 25, 26, 27, 28, 29])
(['1', '2', '3', '4', '5', '6', '7', '8', '9'],[11, 12, 13, 14, 15, 16, 17, 18, 19],[21, 22, 23, 24, 25, 26, 27, 28, 29])
(<reversed at 0x2cd42810208>,<list_reverseiterator at 0x2cd428102b0>,<reversed at 0x2cd42810128>)
['9', '8', '7', '6', '5', '4', '3', '2', '1']
(<enumerate at 0x2cd449af048>,<enumerate at 0x2cd449af090>,<enumerate at 0x2cd449af288>)
[(0, '1'),(1, '2'),(2, '3'),(3, '4'),(4, '5'),(5, '6'),(6, '7'),(7, '8'),(8, '9')]
[(0, '1'),(1, '2'),(2, '3'),(3, '4'),(4, '5'),(5, '6'),(6, '7'),(7, '8'),(8, '9')]
<zip at 0x2cd44b38548>
[(11, 21),(12, 22),(13, 23),(14, 24),(15, 25),(16, 26),(17, 27),(18, 28),(19, 29)]