python之collections模块

import collections
print([name for name in dir(collections) if not name.startswith("_")])

[‘AsyncIterable‘, ‘AsyncIterator‘, ‘Awaitable‘, ‘ByteString‘, ‘Callable‘, ‘ChainMap‘, ‘Container‘, ‘Coroutine‘, 
‘Counter‘, ‘Generator‘, ‘Hashable‘, ‘ItemsView‘, ‘Iterable‘, ‘Iterator‘, ‘KeysView‘, ‘Mapping‘, ‘MappingView‘, 
‘MutableMapping‘, ‘MutableSequence‘, ‘MutableSet‘, ‘OrderedDict‘, ‘Sequence‘, ‘Set‘, ‘Sized‘, ‘UserDict‘, ‘UserList‘, 
‘UserString‘, ‘ValuesView‘, ‘abc‘, ‘defaultdict‘, ‘deque‘, ‘namedtuple‘]

from collections import namedtuple

# 定义一个namedtuple类型User，并包含name，sex和age属性。
User = namedtuple(‘User‘, [‘name‘, ‘sex‘, ‘age‘])

# 创建一个User对象
user = User(name=‘wqb‘, sex=‘male‘, age=24)

# 也可以通过一个list来创建一个User对象，这里注意需要使用"_make"方法
user = User._make([‘wqb‘, ‘male‘, 24])

print(user)
# User(name=‘wqb‘, sex=‘male‘, age=24)

# 获取用户的属性
print(user.name)      
print(user.sex)    
print(user.age)    

        
# 修改对象属性，注意要使用"_replace"方法
user = user._replace(age=22)
print(user)
# User(name=‘wqb‘, sex=‘male‘, age=22)

# 将User对象转换成字典，注意要使用"_asdict"
print(user._asdict())
# OrderedDict([(‘name‘, ‘wqb‘), (‘sex‘, ‘male‘), (‘age‘, 22)])

#!/usr/bin/python3
 
student = (‘tom‘, 18, ‘male‘, ‘tom @ qq.com‘ )
print(student[0])
if student[1] > 12:
    ...
if student[2] == ‘male‘:  
    ...

#!/usr/bin/python3
 
# 给数字带上含义，和元组中一一对应
name, age, sex, email = 0, 1, 2, 3                        
# 高级：name, age, sex, email = range(4)
student = (‘tom‘, 18, ‘male‘, ‘tom @ qq.com‘ )
print(student[name])
if student[age] > 12:
     print(‘True‘)
if student[sex] == ‘male‘:
    print(‘True‘)

rom collections import namedtuple
 
# 生成一个Student类
Student = namedtuple(‘Student‘, [‘name‘, ‘age‘, ‘sex‘, ‘email‘])
 
s = Student(‘tom‘, 18, ‘male‘, ‘tom@qq.com‘)

print(s.name, s.age, s.sex, s.email)