Python dictionary, tuples, collections

Dictionaries, tuples, collections in Python

-dict

-tuple

-set

Dict dictionary additions and Deletions dictionary creation

my_dict = {‘a‘:1,‘b‘:2}my_dict

{‘a‘: 1, ‘b‘: 2}

de8ug = {‘name‘:‘de8ug‘,         ‘city‘:‘beijing‘,         ‘code‘:‘python‘}   #个人信息de8ug[‘name‘]

‘de8ug‘

de8ug[‘city‘]

‘beijing‘

de8ug.get(‘name‘)    #尝试去获取name的值

‘de8ug‘

de8ug.get(‘beijing‘)  #如果没有返回为空

None

de8ug.get(‘beijing‘,‘shanghai‘)   #如果为空，就返回为上海

‘shanghai‘

The increase of the dictionary

de8ug[‘age‘] = 18de8ug

{‘name‘: ‘de8ug‘, ‘city‘: ‘beijing‘, ‘code‘: ‘python‘, ‘age‘: 18}

de8ug[‘student‘] = [‘lilei‘,‘hmm‘,‘tony‘]  #字典嵌套列表de8ug

{‘name‘: ‘de8ug‘, ‘city‘: ‘beijing‘, ‘code‘: ‘python‘, ‘age‘: 18, ‘student‘: [‘lilei‘, ‘hmm‘, ‘tony‘]}

book = {‘name‘:‘python3‘,‘price‘:100}

de8ug[‘book‘] = book   #字典嵌套字典de8ug                  

{‘name‘: ‘de8ug‘, ‘city‘: ‘beijing‘, ‘code‘: ‘python‘, ‘age‘: 18, ‘student‘: [‘lilei‘, ‘hmm‘, ‘tony‘], ‘book‘: {‘name‘: ‘python3‘, ‘price‘: 100}}

Deletion of dictionaries

del de8ug[‘name‘]de8ug

{‘city‘: ‘beijing‘, ‘code‘: ‘python‘, ‘age‘: 18, ‘student‘: [‘lilei‘, ‘hmm‘, ‘tony‘], ‘book‘: {‘name‘: ‘python3‘, ‘price‘: 100}}

Modification of the dictionary

de8ug[‘age‘] = 20de8ug

{‘city‘: ‘beijing‘, ‘code‘: ‘python‘, ‘age‘: 20, ‘student‘: [‘lilei‘, ‘hmm‘, ‘tony‘], ‘book‘: {‘name‘: ‘python3‘, ‘price‘: 100}}

A variety of dictionary search

de8ug[‘book‘]

{‘name‘: ‘python3‘, ‘price‘: 100}

de8ug[‘book‘][‘price‘]   #类似找谁家的小孩

100

de8ug.keys()

dict_keys([‘city‘, ‘code‘, ‘age‘, ‘student‘, ‘book‘])

[ i for i in de8ug.keys()]

[‘city‘, ‘code‘, ‘age‘, ‘student‘, ‘book‘]

[ i for i in de8ug]

[‘city‘, ‘code‘, ‘age‘, ‘student‘, ‘book‘]

de8ug.items()    #所有项

dict_items([(‘city‘, ‘beijing‘), (‘code‘, ‘python‘), (‘age‘, 20), (‘student‘, [‘lilei‘, ‘hmm‘, ‘tony‘]), (‘book‘, {‘name‘: ‘python3‘, ‘price‘: 100})])

for item in de8ug.items():    print(item)                 #去每一项

(‘city‘, ‘beijing‘)(‘code‘, ‘python‘)(‘age‘, 20)(‘student‘, [‘lilei‘, ‘hmm‘, ‘tony‘])(‘book‘, {‘name‘: ‘python3‘, ‘price‘: 100})

Additions and deletions of tuple tuples

Why,what,how

Coordinates (x, y)

Box (x, Y, z)

cor = 23,56

type(cor)

tuple

cor2 = (23,56)

type(cor2)

tuple

#不可变ip_port = (‘192.168.1.1‘,8001)host = {}host[‘ip_port‘] = ip_port     #一个是key，一个是valuehost

{‘ip_port‘: (‘192.168.1.1‘, 8001)}

host[‘ip_port‘][0]

‘192.168.1.1‘

host[‘ip_port‘][1]

8001

#类似列表，不需要修改时候使用ip = (‘192.168.1.2‘)

type(ip)

str

host[ip] = ‘adminpc‘

host

{‘ip_port‘: (‘192.168.1.1‘, 8001), ‘192.168.1.2‘: ‘adminpc‘}

ip = (‘192.168.1.2‘,)   #元组成对出现type(ip)

tuple

Tuple to list conversion

names = [‘lilei‘,‘hmm‘,‘jack‘]type(names)

list

tuple(names)

(‘lilei‘, ‘hmm‘, ‘jack‘)

type(names)

list

type(tuple(names))

tuple

names

[‘lilei‘, ‘hmm‘, ‘jack‘]

host[names] = ‘admin‘    #报错，列表可变

---------------------------------------------------------------------------TypeError                                 Traceback (most recent call last)<ipython-input-69-c0390f036cc8> in <module>()----> 1 host[names] = ‘admin‘TypeError: unhashable type: ‘list‘

name_tuple = (‘lilei‘,‘hmm‘,‘jack‘)

host[name_tuple] = ‘admin‘   #不报错，元组不可变host

{‘ip_port‘: (‘192.168.1.1‘, 8001), ‘192.168.1.2‘: ‘adminpc‘, (‘lilei‘, ‘hmm‘, ‘jack‘): ‘admin‘}

Set set, non-repeating element set collection creation

numbers = {1,2,3,1,3,4,5,6}

type(numbers)

set

numbers

{1, 2, 3, 4, 5, 6}

Set Collection View

numbers[0]   ##不支持

---------------------------------------------------------------------------TypeError                                 Traceback (most recent call last)<ipython-input-81-7486ea9d37bc> in <module>()----> 1 numbers[0]TypeError: ‘set‘ object does not support indexing

for i in numbers:    print(i)

123456

#列表others = [2,3,4,6,7,7]set(others)     #列表转换成set集合

{2, 3, 4, 6, 7}

len(others)    #others还是列表

6

type(others)

list

len(set(others))

5

Python dictionary, tuples, collections