Python编程-基础知识-列表和元组-蒲公英云

Python编程-基础知识-列表和元组

向右看齐 2021-12-24 12:45 348阅读 0赞

列表示例1：

（新建, 删除, 修改）

# basic operation of list
names = [ ‘ David ‘, ‘ George ‘, ‘ Peter ‘, ‘ Mark ‘, ‘ ALice ‘]
print “ Original List: “
print names
del names[1]
print “ Delete second element: “
print names
names[1] = “ Anthony “
print “ Change second element: “
print names

运行结果：

Original List:
[‘David’, ‘George’, ‘Peter’, ‘Mark’, ‘ALice’]
Delete second element:
[‘David’, ‘Peter’, ‘Mark’, ‘ALice’]
Change second element:
[‘David’, ‘Anthony’, ‘Mark’, ‘ALice’]

列表示例2：

（分片操作）

-- Python中使用分片操作来访问一定范围内的元素

# -*- coding: cp936 -*-

“””
列表的分片操作
“””
name = list( “ Perl “)
print “ Original List From String: “
print name
name[2:] = list( “ ice “)
print “ Change elements after second: “
print name
name[2:] = list( “ ar “)
print name
number = [1, 2, 3, 5, 6, 7]
print “ Original Number List: “
print number
number.insert(3, “ four “)
print “ Insert before the forth number: “
print number
number.pop()
print “ Pop last number: “
print number
number.pop(0)
print “ Pop first number: “
print number
number.pop(1)
print “ Pop second number: “
print number

运行结果：

Original List From String:
[‘P’, ‘e’, ‘r’, ‘l’]
Change elements after second:
[‘P’, ‘e’, ‘i’, ‘c’, ‘e’]
[‘P’, ‘e’, ‘a’, ‘r’]
Original Number List:
[1, 2, 3, 5, 6, 7]
Insert before the forth number:
[1, 2, 3, ‘four’, 5, 6, 7]
Pop last number:
[1, 2, 3, ‘four’, 5, 6]
Pop first number:
[2, 3, ‘four’, 5, 6]
Pop second number:
[2, ‘four’, 5, 6]

元组示例：

元组是不能被修改的序列

它可以在映射中当作键使用

# tuple sample
print tuple([1, 2, 3])
print tuple( ‘ abc ‘)
print tuple((1, 2, 3))

运行结果：

(1, 2, 3)
(‘a’, ‘b’, ‘c’)
(1, 2, 3)

转载于//www.cnblogs.com/davidgu/archive/2012/03/15/2397637.html