Python中数组用法大全详解编程语言

#!/usr/bin/env python 
# 
# [SNIPPET_NAME: Lists 101] 
# [SNIPPET_CATEGORIES: Python Core] 
# [SNIPPET_DESCRIPTION: Basic and not so basic list operations] 
# [SNIPPET_AUTHOR: Bruno Girin <[email protected]>] 
# [SNIPPET_LICENSE: GPL] 
 
# This snippet demonstrates how the basics on lists: how to create, add, 
# remove items, get items or slices, sort, etc. 
 
# 
# First, let's create simple list 
# 
print "Create a simple list" 
simpleList = ["Karmic", "Lucid", "Hardy", "Jaunty", "Intrepid"] 
# print it 
print simpleList 
# 
# Interrogate the list 
# 
print "/nInterrogate the list" 
# get item 3:  lists start counting at 0 so it should be Jaunty 
print simpleList[3] 
# we can also get a slice 
print simpleList[2:4] 
# get the first three items 
print simpleList[:3] 
# or all items from number index 3 (which is the fourth item) to the end 
print simpleList[3:] 
# we can also take every other item, as a slice is defined 
# like this: start:stop:step 
print simpleList[::2] 
# get the length of the list 
print len(simpleList) 
# we can get the index of an item in the list 
print simpleList.index("Hardy") 
# and when the list doesn't contain the item, we get an error that we can catch 
try: 
    print simpleList.index("Feisty") 
except ValueError: 
    print "The list doesn't contain the item Feisty" 
# 
# Modify the list 
# 
print "/nModify the list" 
# add another item 
simpleList.append("Twisty") 
print simpleList 
# oops! let's sort this out by replacing in place 
simpleList[5] = "Gutsy" 
print simpleList 
# extend the list with another one 
otherList = ["Edgy", "Breezy"] 
simpleList.extend(otherList) 
print simpleList 
# remove an item from the list (Hardy should not be in the list anymore) 
del simpleList[2] 
print simpleList 
# insert an item in the middle of the list 
simpleList.insert(4, "Hardy") 
print simpleList 
# remove an item by its value rather than its index 
simpleList.remove("Edgy") 
print simpleList 
# 
# Create modified copies of the list 
# 
print "/nCreate modified copies of the list" 
# sort it 
print sorted(simpleList) 
# join it to produce a custom print 
print ' => '.join(sorted(simpleList)) 
# lists can contain the same item several times so if we add Lucid again: 
simpleList.append("Lucid") 
# we have it twice in the list (easier to see if we sort it) 
print sorted(simpleList) 
# but we can get round that by transforming it into a set, which is a list 
# with no duplicates; and of course we can also sort the set 
print sorted(set(simpleList)) 
# 
# Iterate over the list 
# 
print "/nIterate over the list" 
for i in simpleList: 
    print i.upper() 
# but if we want to create another list by applying the same expression to 
# each item, we can use a list comprehension 
upList = [i.upper() for i in sorted(set(simpleList))] 
print upList