具名元组

1、

from collections import namedtuple

City=namedtuple('City','name country population coordinates')

City._fields   #类属性
Out[17]: ('name', 'country', 'population', 'coordinates')

Latlong = namedtuple('Latlong','Lat Long')

beijing=('Beijing','China',2200,Latlong(40,120))

City._make(beijing)  #类方法 相当于City(*beijing)
Out[20]: City(name='Beijing', country='China', population=2200, coordinates=Latlong(Lat=40, Long=120))

Beijing=City._make(beijing)

Beijing._asdict() #实例方法
Out[22]: 
OrderedDict([('name', 'Beijing'),
             ('country', 'China'),
             ('population', 2200),
             ('coordinates', Latlong(Lat=40, Long=120))])

2、除了增减元素之外,元组支持列表其他所有方法。

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