【Python学习记录】字典

（1）定义：

stu ={"name": "zxc","school": "hqu"
}

（2）访问：

print(stu["name"])
print(stu["school"])

结果：

zxc
hqu

（3）添加键-值

stu ={"name": "zxc","school": "hqu"
}stu["age"] = 19

（4）修改键-值

stu ={"name": "zxc","school": "hqu"
}stu["name"]="cj"

（5）删除键-值

del stu["name"]

（6）遍历字典

  （6.1）遍历键-值 items（）   返回一个键-值列表

stu ={"name": "zxc","school": "hqu"
}for key,value in stu.items():print(key+":"+value)

结果：

name:zxc
school:hqu

  （6.2）遍历所有的键 key（）    返回一个键列表

stu ={"name": "zxc","school": "hqu"
}for key in stu.keys():print(key)

结果：

name
school

  （6.3）遍历所有的值 values（）       返回一个值列表

stu ={"name": "zxc","school": "hqu"
}for value in stu.values():print(value)

结果：

zxc
hqu

（7）字典列表 

  （7.1）定义

定义：列表中包含着很多字典。

zxc = {"name": "zxc","school": "hqu"
}lzh = {"name": "lzh","school": "police"
}stu = [zxc, lzh]

  （7.2）在字典列表中添加

方法：append（）

zxc = {"name": "zxc","school": "hqu"
}lzh = {"name": "lzh","school": "police"
}stu =[zxc,lzh]yyb = {"name": "yyb","school": "xmu"
}stu.append(yyb)

（8）在字典中存储列表

    (8.1)定义

stu = {"name":"zxc","school":["tkk","hqu","xmu"]
}

（8.2）访问列表

stu = {"name":"zxc","school":["tkk","hqu","xmu"]
}school = stu["school"]
print(school)

（9）字典中的字典

stu = {"zxc":{"school": "hqu","target": "xmu"},"zlh":{"name": "lzh","information": {"school": "police","target": "zz"}}}

访问：

stu = {"zxc":{"school": "hqu","target": "xmu"},"zlh":{"name": "lzh","information": {"school": "police","target": "zz"}}}zxc = stu["zxc"]
for key,value in zxc.items():print(key+":"+value)

结果:

school:hqu
target:xmu

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