Python 字典经常使用方法

#Author is lizhenlei#字典的特性：#    dict是无序的#    key必须是惟一的，so天生去重#key：value（键：值）info = {    'stu1101' : "TengLan Wu",    'stu1102' : "LongZe Luola",    'stu1103' : "XiaoZe Maliya",}print(info)print(info['stu1101'])   #查找字典info["stu1101"] = "武藤兰" #修改字典内容info["stu1104"] = "CangJingKong" #存在即修改，不存在增长#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#多级嵌套字典及操做 字典能够内嵌列表也能够内嵌字典print(info)info.values()  #打印全部不包括key的值info.keys()    #打印全部key值av_catalog = {    "欧美":{        "www.youporn.com": ["不少免费的,世界最大的","质量通常"],        "www.pornhub.com": ["不少免费的,也很大","质量比yourporn高点"],        "letmedothistoyou.com": ["可能是自拍,高质量图片不少","资源很少,更新慢"],        "x-art.com":["质量很高,真的很高","所有收费,屌比请绕过"]    },    "日韩":{        "tokyo-hot":["质量怎样不清楚,我的已经不喜欢日韩范了","据说是收费的"]    },    "大陆":{        "1024":["所有免费,真好,好人一辈子平安","服务器在国外,慢"]    }}av_catalog["大陆"]["1024"][1] = '能够在国内作镜像'av_catalog.setdefault("大陆",{'www.baidu.com':[1,2]})   #在字典中寻找key值，能取到不变，取不到，赋新值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] = 9print(c)info3 = {    'stu1101' : "TengLan Wu",    'stu1102' : "LongZe Luola",    'stu1103' : "XiaoZe Maliya",}for i in info3:             #字典的循环 更高效    print(i, info3[i])for k,v in info3.items():   #字典的循环    print(k, v)