简明Python教程笔记三 python3.x

三数据结构

1.列表list
#Filename:List.py
ShopList = ['mongo','banana','apple','orange'] #创建 
print('len:',len(ShopList)) #求长度
for item in ShopList:#遍历
print (item)
ShopList.append('jujube') #增加
ShopList.sort()#排序
print('sorted:',ShopList)
del ShopList[1]#删除
print('del:',ShopList)
ShopList[2]='grape' #赋值
print('change:',ShopList)

2.元组
内容不可变
zoo = ('wolf','dog','elephant')

3.字典 dict
dictData ={'a':'aQb','b':'bQb','c':'cQb'}
键值对，键值不可变，值可变
字典无序，如有需要手动调用sort

4.引用
#Filename:Ref.py
Orilist=['a','b','c']
Newlist = Orilist
del Orilist[0]
print(Orilist)
print(Newlist)

RealList = Orilist[:]
del Orilist[0]
print(Orilist)
print(Newlist)
print(RealList)
输出：
['b', 'c']
['b', 'c']
['c']
['c']
['b', 'c']
如果你想要复制一个列表或者类似的序列或者其他复杂的对象，
那么你必须使用切片操作符来取得拷贝。
例子中Newlist为引用，RealList为拷贝