Python编程-基础知识-列表和元组

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)