python基础知识总结---数据结构---字典

直接实例代码:

#5.0字典:
def directTest():
    #直接定义
    dir_obj = {"name":"Tom","sex":"man","age":"15","address":"fist streets"}
    print "字典的定义:",dir_obj;

    #其他转成字典
    dir_list = [("1",("tome","24","usa","like you"))]
    dir_to = dict(dir_list)
    print "dir_to items:",dir_to

    print "字典的长度:",len(dir_obj)
    print "--根据key找value--", dir_obj["sex"]

    ##空字典赋值
    dir_me = {}
    dir_me["title"]="TEST"
    dir_me["URL"]="www.sisico.com"
    print "--空字典赋值后-dir_me::",dir_me

    #对字典的访问
    #1.直接dir[key]访问  这样直接取去,如果字典没有ITEM会报错
    #2.dic.get(key) 用get访问  当用get获取字典item是,没有的ITEM 会出None
    print "dir_me item:",dir_me.get("title")
    print "dir_me items:",dir_me.items()

    #检测字典的key是否存在  key in dic
    print "check key 是否在字典中:","age" in dir_obj
    print "字典中的key集合:",dir_obj.keys();
    print "字典中value的集合:",dir_obj.values()

    #对字典的item变更
    dir_obj["sex"] = "wower"
    print "更改key对应的value--",dir_obj["sex"]  ##wower



    #-删除字典中的项-
    # 1.del dic["item"]  item===key
    # 2.dic.pop("item") item == key
    # 3.dic.popitem() 删除一项
    print "-dic items --",dir_obj
    del dir_obj["age"]
    print "-delete0 --",dir_obj
    dir_obj.pop("name")
    print "-delete1 --",dir_obj
    dir_obj.popitem()
    print "-delete2 --",dir_obj

 

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