python--part2

六、向数组中添加内容append

 

shoplist = ['apple', 'mango', 'carrot', 'banana']

 

print 'I have', len(shoplist),'items to purchase.'

 

print 'These items are:', # Notice the comma at end of the line

 

for item in shoplist:   # 遍历数组使用的是 for item in shoplist

    print item,

   

print '\nI also have to buy rice.'

 

shoplist.append('rice')

"""

       想数组中添加内容使用的是：append

"""

 

七、使用sort分组数组

shoplist = ['apple', 'mango', 'carrot', 'banana']      

 

shoplist.sort()

 

print 'Sorted shopping list is', shoplist

 

Sorted shopping list is ['apple', 'banana', 'carrot', 'chen', 'mango']   #分组之后的数组。

 

 

分组是按照首字母来分组的。

 

八、删除数组成员

 

shoplist = ['apple', 'mango', 'carrot', 'banana']

 

olditem = shoplist[0]

 

del shoplist[0]   #使用del来实现对数组的第一个成员进行删除

 

print 'I bought the', olditem

 

print 'My shopping list is now', shoplist

 

九、求数组的长度

shoplist = ['apple', 'mango', 'carrot', 'banana']

 

print 'I have', len(shoplist),'items to purchase.'

 

十、for循环

shoplist=['apple','banana','chen','chenlei','wuxi']

 

print 'shoplist num is :',len(shoplist)

 

shoplist.append('bad')

 

for item in shoplist:

print item,   #注意这里加上了一个“ , ”号，要是不加上的话就会每输出一个就自动换行

 

--------------------------------

结果 ：

shoplist num is : 5

apple banana chen chenlei wuxi bad