Common methods for Python dictionaries

#Author is Lizhenlei


#字典的特性:
# dict is disordered.
# key must be unique, so naturally go heavy


#key: Value (key: Values)
info = {
' stu1101 ': "Tenglan Wu",
' stu1102 ': "Longze Luola",
' stu1103 ': "Xiaoze Maliya",
}
Print (info)
Print (info[' stu1101 ') #查找字典
info["stu1101"] = "Enrique" #修改字典内容
info["stu1104"] = "Cangjingkong" #存在即修改, there is no increase

#del info["stu1101"]
Info.popitem () #随便删除任意一个字典中的键值对

Print (Info.get (' stu1104 ')) #不出错查找字典内容

Print (' stu1103 ' in info) #查找字典中是否存在 info.has_key (' 1103 ') in Python 2.x

#多级嵌套字典及操作 dictionaries can be inline lists or inline dictionaries

Print (info)

Info.values () #打印所有不包括key的值
Info.keys () #打印所有key值



Av_catalog = {
"Europe and America": {
"Www.youporn.com": ["a lot of free, the world's largest", "General quality"],
"Www.pornhub.com": ["a lot of free, also very big", "quality than Yourporn high"],
"Letmedothistoyou.com": ["mostly selfie, high-quality pictures many", "resources are not many, update slow"],
"X-art.com": ["high quality, really high", "all charges, Dick than please bypass"]
},
"Japan and Korea": {
"Tokyo-hot": ["How the quality is not clear, the individual has not liked the Japanese and Korean fan", "Heard is charged"]
},
"Continent": {
"1024": ["All free, really good, good Life Peace", "server in foreign countries, slow"]
}
}

av_catalog["mainland" ["1024"][1] = ' can mirror in China '

Av_catalog.setdefault ("Continent", {' www.baidu.com ': [Up]}) #在字典中寻找key值, can be taken unchanged, not taken, and assigned a new value

Print (Av_catalog)


Info2 = {
' stu1101 ': "Tenglan Wu",
' stu1102 ': "Longze Luola",
' stu1103 ': "Xiaoze Maliya",
}

b = {
' stu1101 ': "Alex",
1:3,
2:5
}

Info2.update (b)
Info2.items ()
Print (Info2.items ()) #把一个字典转成列表

c = Dict.fromkeys ([6,7,8],[1,{"name": "Alex"},444]) #初始化一个新的字典
C[7][1] = "Jeck Chen"
#c [6][0] = 9
Print (c)


Info3 = {
' stu1101 ': "Tenglan Wu",
' stu1102 ': "Longze Luola",
' stu1103 ': "Xiaoze Maliya",
}

For i in Info3: #字典的循环 more efficient
Print (I, info3[i])

For k,v in Info3.items (): #字典的循环
Print (k, v)

Common methods for Python dictionaries