一鼓作气 博客--第三篇 note3

1 推荐读书消费者行为学 -商业的本质，APP得到，5分钟商学院

2定义字典

dic={'name':haibao,'age':18}

3字典的基本操作--查询

dic={'name':'haibao','age':18}

print(dic['name'])

4 字典的意义 列表查询

names=[

['alex',333,333],

['alex1', 333, 3533],

['alex2', 333, 3533],

['alex3', 3343, 3533],

['alex4', 35533, 3333],

['alex5', 3353, 3353],

['alex6', 3533, 3533],

['alex7', 3533, 3353],

]

print(names.index( ['alex5', 3353, 3353]))

*******

output:

5

5字典套字典

names = {
    845573128:{
        'name':'haibao'
        'age':'99'
        'favorite':'bag'
},
    845573128:{
        'name':'hailing'
        'age': '180'
        'favorite':'eat'
}
}
print(names)

6字典查询结果 get方法

names = {
    845573128:{
        'name':'haibao',
        'age':99,
        'favorite':'bag'
},
    845573128:{
        'name':'hailing',
        'age': 180,
        'favorite':'eat'
}
}
print(names.get(845573128).get('name'))

******

output: hailing

9dict 简单的查询

dict={'name':'bairuyuan','age':11}

print(dict['name'])

10字典无序插入

dict={'name':'bairuyuan','age':11}
print(dict['name'])
dict['gender']='male'
print(dict)

11改名字

dict={'name':'bairuyuan','age':11}

print(dict['name'])

dict['gender']='male'
print(dict)
dict['name']='yihang'
print(dict)

*************output:

bairuyuan 
{'age': 11, 'name': 'bairuyuan', 'gender': 'male'} 
{'age': 11, 'name': 'yihang', 'gender': 'male'}

12删除

dic5={'name':'haibao','age':18,'qq':'845573128'}

del dic5['age']

print(dic5)

dict={'name':'bairuyuan','age':11}
del dict['age']
print(dict)

************ouput

{'name': 'bairuyuan'}

13数据类型的key是否可变：

1、不可变：数字，字符串，元祖

2、列表，字典

通过是否可以HASH，来判断是否能可变

字典的key定义规则：

1、不可变

2、唯一

14列表的元素可以变，元祖的元素不可变

16key原封不动取值,如何定义，如何取值

dic4=dict((('name','haibao'),('age',18),('qq',88388383 )))

print(dic4(('name','haibao'),('age',18),('qq',88388383 )))

17定义字典方法

dic1={'name':'haibao','age':18,'qq':'845573128'}

print(dic1)

print(dic1['qq'])

dic2=dict(name='haibao',age=18,qq=7883993)

print(dic2)

dic3=dict({'name':'haibao','age':18,'qq':845573128})

print(dic3)

dic4=dict((('name','haibao'),('age',18),('qq',88388383 )))

print(dic4)

output:

{'name': 'haibao', 'qq': '845573128', 'age': 18}

845573128

{'name': 'haibao', 'qq': 7883993, 'age': 18}

{'name': 'haibao', 'qq': 845573128, 'age': 18}

{'name': 'haibao', 'qq': 88388383, 'age': 18}

18快速生成字典 dict.fromkeys

dict1=dict.fromkeys(['a,b,c'],1)

print(dict1)

19dict.get()

dict={'name':'bairuyuan','age':11}
print(dict.get('name'))

20dic.items()

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5)

print(dic5.items())

21dic.items

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5)

print(dic5.items())

for i in dic5.items():

print(i)

22dic.item()

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5)

print(dic5.items())

for i in dic5.items():

print(i)

for k,v in dic5.items():

print(k,v)

23dic.keys()

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5)

print(dic5.keys())

24dic.key()

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5)

print(dic5.keys())

for i in dic5.keys():

print(i)

****

{'name': 'haibao', 'qq': '845573128', 'age': 18}

dict_keys(['name', 'qq', 'age'])

25key value

dic5={'name':'haibao','age':18,'qq':'845573128'}
print(dic5)
print(dic5.keys())
for i in dic5.keys():
    print('key is %s,value is %s'%(i,dic5[i]))

*******************OUTPUT:

{'qq': '845573128', 'age': 18, 'name': 'haibao'} dict_keys(['qq', 'age', 'name']) key is qq,value is 845573128 845573128 key is age,value is 18 18 key is name,value is haibao haibao

26pop 必须存在才能删除

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic5.pop('age')
print(dic5)

27 popitem() 随机删除一个

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic5.popitem()
print(dic5)

28setdefault()

dic5={'name':'haibao','age':18,'qq':'845573128'}

dic5.setdefault('likecolor',[])
dic5.setdefault('likecolor',[]).append('blue')
print(dic5)

*************output:

{'age': 18, 'likecolor': ['blue'], 'qq': '845573128', 'name': 'haibao'}

29update

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic1={'gender':'male'}
dic5.update(dic1)
print(dic5)

*************output

{'name': 'haibao', 'age': 18, 'qq': '845573128', 'gender': 'male'}

30update 修改NAME value

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic1={'gender':'male','name':'hailing'}
dic5.update(dic1)
print(dic5)

*******ouput

{'age': 18, 'qq': '845573128', 'name': 'hailing', 'gender': 'male'} 31update 3

 

32values 1

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic1={'gender':'male','name':'hailing'}
dic5.update(dic1)
print(dic5)
print(dic5.values())

*****output:

{'age': 18, 'name': 'hailing', 'gender': 'male', 'qq': '845573128'}

dict_values([18, 'hailing', 'male', '845573128'])

33values 只打印元素

dic5={'name':'haibao','age':18,'qq':'845573128'}
print(dic5.values())
for i in dic5.values():
    print(i) 

34 dic.fromkeys ==dict.fromkeys()

dic5={'name':'haibao','age':18,'qq':'845573128'}

print(dic5.fromkeys([1,2,3]))
print(dic5.fromkeys([1,2,3],'haibao'))
print(dic5.fromkeys([1,2,3],{'name':'haibao','age':18,'qq':'845573128'}))

output:

{1: None, 2: None, 3: None} 

{1: 'haibao', 2: 'haibao', 3: 'haibao'}

 {1: {'qq': '845573128', 'name': 'haibao', 'age': 18}, 2: {'qq': '845573128', 'name': 'haibao', 'age': 18}, 3: {'qq': '845573128', 'name': 'haibao', 'age': 18}} 

 

36 key 坑

data = dict.fromkeys([1,2,3,4],{'name':'haibao','age':18,'qq':'845573128'})
print(data)
data[1]['name']="hailing"
print(data)

**********output:

{1: {'qq': '845573128', 'age': 18, 'name': 'haibao'}, 2: {'qq': '845573128', 'age': 18, 'name': 'haibao'}, 3: {'qq': '845573128', 'age': 18, 'name': 'haibao'}, 4: {'qq': '845573128', 'age': 18, 'name': 'haibao'}}

{1: {'qq': '845573128', 'age': 18, 'name': 'hailing'}, 2: {'qq': '845573128', 'age': 18, 'name': 'hailing'}, 3: {'qq': '845573128', 'age': 18, 'name': 'hailing'}, 4: {'qq': '845573128', 'age': 18, 'name': 'hailing'}}

37copy 坑

dic5={'name':'haibao','age':18,'qq':'845573128'}
dic6=dic5.copy()
print(dic6) 

38copy 坑

dic5={'name':'haibao','age':18,'qq':['845573128','2728049959','65655656']}
dic6=dic5.copy()
print(dic6)
dic6["name"]='hailing'
print(dic5,dic6)

*******ouput:

 {'qq': ['845573128', '2728049959', '65655656'], 'name': 'haibao', 'age': 18}

 {'qq': ['845573128', '2728049959', '65655656'], 'name': 'haibao', 'age': 18} {'qq': ['845573128', '2728049959', '65655656'], 'name': 'hailing', 'age': 18}

39

40 字典里的copy是浅copy ,只copy 第一层，

import copy

41深 copy.deepcopy()

42copy.copy() 浅copy = dic.copy