Python_collection_namedtuple可命名元组

Posted 2021-01-04 Vera_y

namedtuple：用来构建带字段名的元组

import collections
# 创建类,两种创建方法
MytupleClass = collections.namedtuple(‘MytupleClass‘, ‘x y z‘)
# MytupleClass = collections.namedtuple(‘MytupleClass‘,[ ‘x‘, ‘y‘, ‘z‘])
obj = MytupleClass(11, 22, 33)      # 相当于创建了一个obj对象 x=11, y=22, z=33
print(obj.x)
print(obj.y)
print(obj.z)

结果：

11
22
33

类._make([ ]):用列表的形式创建对象

import collections
MytupleClass = collections.namedtuple(‘MytupleClass‘,[ ‘x‘, ‘y‘, ‘z‘])
new = MytupleClass._make([11, 22, 44])
print(new)

结果：

MytupleClass(x=11, y=22, z=44)

x._replace():替换对象

x._asdict():转换为字典

import collections
MytupleClass = collections.namedtuple(‘MytupleClass‘,[ ‘x‘, ‘y‘, ‘z‘])
new = MytupleClass._make([11, 22, 44])
new = new._replace(z=9)
print(new)
print(new.asdict())

结果：

MytupleClass(x=11, y=22, z=9)
OrderedDict([(‘x‘, 11), (‘y‘, 22), (‘z‘, 9)])