python字典深入分析

 

一、删除字典元素（pop方法和del）

dic1=  {
    "name": "dsj",
    "age":30,
    "sex": "female"
}


#dic1.pop("name")

del dic1["name"]
print(dic1)

 

二、根据指定的KEY，完成键值替换（不推荐实际开发时使用）

dic1=  {
    "name": "dsj",
    "age":30,
    "sex": "female"
}

n=dic1.fromkeys(["name","age","sex"],"test")
print(n)

三、两种添加字典元素的方式

dic1=  {
    "name": "dsj",
    "age":30,
    "sex": "female"
}

dic1.update({"interest":"football"})
print(dic1)

dic1["demo"]="love"
print(dic1)

 四、作业

# 把列表里的数字分两组，大于66或小于66

li=[11,22,33,44,55,66,77,88,99,90]


dic={"k1":[],"k2":[]}

for i in li:
    if i<=66:
        dic["k1"].append(i)
    else:
        dic["k2"].append(i)

print(dic["k1"])
print(dic["k2"])




# lismall=[]
# lilarge=[]
#
# for i in li:
#     if i<=66:
#         lismall.append(i)
#     else:
#         lilarge.append(i)
#
# print(lismall)
# print(lilarge)

 

五、作业二

#实现输入选择
li=["手机","电脑","鼠标垫","游艇"]

for i,j in enumerate(li):
    print(i+1,j)  #打印编号及内容

num=input("num is:")
num=int(num)
if num>0 and num<len(li)+1:
    goods=li[num-1]
    print(goods)
else:
    print("不存在")