python技巧 namedtuple

python的namedtuple可以创建一个带字段名的元祖和一个带名字的类

In [1]: from collections import namedtuple
   ...:
   ...: nginx=namedtuple('nginx',['active','accepts','handled','requests','reading','writing','waiting'])
   ...:

In [2]: get_nginx=nginx(1,2,3,4,11,111,22)

In [3]: get_nginx.active
Out[3]: 1

In [4]: get_nginx
Out[4]: nginx(active=1, accepts=2, handled=3, requests=4, reading=11, writing=111, waiting=22)

namedtuple的几个属性

_fields 类属性
    _make(iterable) 类方法
    _asdict() 实例方法

In [7]: nginx._fields
Out[7]: ('active', 'accepts', 'handled', 'requests', 'reading', 'writing', 'waiting')

In [8]: get_nginx._asdict()
Out[8]:
OrderedDict([('active', 1),
             ('accepts', 2),
             ('handled', 3),
             ('requests', 4),
             ('reading', 11),
             ('writing', 111),
             ('waiting', 22)])

In [12]: new_nginx=(1,2,3,4,5,6,7)

In [13]: new=nginx._make(new_nginx)

In [14]: new
Out[14]: nginx(active=1, accepts=2, handled=3, requests=4, reading=5, writing=6, waiting=7)