转载自:https://blog.csdn.net/helei001/article/details/52692128/
Python中存储系列数据,比较常见的数据类型有list,除此之外,还有tuple数据类型。相比与list,tuple中的元素不可修改,在映射中可以当键使用。tuple元组的item只能通过index访问,collections模块的namedtuple子类不仅可以使用item的index访问item,还可以通过item的name进行访问。可以将namedtuple理解为c中的struct结构,其首先将各个item命名,然后对每个item赋予数据。
例1:
coordinate = namedtuple('Coordinate', ['x', 'y'])
co = coordinate(10,20)
print co.x,co.y
print co[0],co[1]
co = coordinate._make([100,200])
print co.x,co.y
co = co._replace(x = 30)
print co.x,co.y
Output:
10 20
10 20
100 200
30 200
例2:
from collections import namedtuple
websites = [
('Sohu', 'http://www.google.com/', u'张朝阳'),
('Sina', 'http://www.sina.com.cn/', u'王志东'),
('163', 'http://www.163.com/', u'丁磊')
]
Website = namedtuple('Website', ['name', 'url', 'founder'])
for website in websites:
website = Website._make(website)
print website
Output:
Website(name='Sohu', url='http://www.google.com/', founder=u'\u5f20\u671d\u9633')
Website(name='Sina', url='http://www.sina.com.cn/', founder=u'\u738b\u5fd7\u4e1c')
Website(name='163', url='http://www.163.com/', founder=u'\u4e01\u78ca')
参考资料:
[1] http://blog.csdn.net/kongxx/article/details/51553362
[2] http://www.jb51.net/article/88144.htm
[3] http://www.jb51.net/article/48771.htm