list是處理一組有序項(xiàng)目的數(shù)據(jù)結(jié)構(gòu)，即你可以在一個(gè)列表中存儲(chǔ)一個(gè) 序列 的項(xiàng)目。假想你有
一個(gè)購(gòu)物列表，上面記載著你要買(mǎi)的東西，你就容易理解列表了。只不過(guò)在你的購(gòu)物表上，可
能每樣?xùn)|西都獨(dú)自占有一行，而在Python中，你在每個(gè)項(xiàng)目之間用逗號(hào)分割。
列表中的項(xiàng)目應(yīng)該包括在方括號(hào)中，這樣Python就知道你是在指明一個(gè)列表。一旦你創(chuàng)建了一
個(gè)列表，你可以添加、刪除或是搜索列表中的項(xiàng)目。由于你可以增加或刪除項(xiàng)目，我們說(shuō)列表
是 可變的 數(shù)據(jù)類(lèi)型，即這種類(lèi)型是可以被改變的。
#!/usr/bin/python
# Filename: using_list.py
# This is my shopping list
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:
print item,
print '\nI also have to buy rice.'
shoplist.append('rice')
print 'My shopping list is now', shoplist
print 'I will sort my list now'
shoplist.sort()
print 'Sorted shopping list is', shoplist
print 'The first item I will buy is', shoplist[0]
olditem = shoplist[0]
del shoplist[0]
print 'I bought the', olditem
print 'My shopping list is now', shoplist $ python using_list.py
I have 4 items to purchase.
These items are: apple mango carrot banana
I also have to buy rice.
My shopping list is now ['apple', 'mango', 'carrot', 'banana', 'rice']
I will sort my list now
Sorted shopping list is ['apple', 'banana', 'carrot', 'mango', 'rice']
The first item I will buy is apple
I bought the apple
My shopping list is now ['banana', 'carrot', 'mango', 'rice']
注意，我們?cè)趐rint語(yǔ)句的結(jié)尾使用了一個(gè) 逗號(hào) 來(lái)消除每個(gè)print語(yǔ)句自動(dòng)打印的換行符。這樣
做有點(diǎn)難看，不過(guò)確實(shí)簡(jiǎn)單有效。