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attrs 可以简单理解为namedtuple的增强版
安装
pip install attrs
代码示例
1、定义一个tuple
p1 = (1, 2) p2 = (1, 2) print(p1 == p2) # True print(p1) # (1, 2)
2、namedtuple定义一个类
from collections import namedtuple
Point = namedtuple("Point", ["x", "y"])
p1 = Point(1, 2)
p2 = Point(1, 2)
print(p1 == p2)
# True
print(p1)
# Point(x=1, y=2)3、使用 attr动态定义一个类
import attr
Point = attr.make_class("Point", ["x", "y"])
p1 = Point(1, 2)
p2 = Point(1, 2)
print(p1 == p2)
# True
print(p1)
# Point(x=1, y=2)4、使用 attr定义一个类
import attr
@attr.s
class Point(object):
x = attr.ib(default=1) # 定义默认参数
y = attr.ib(kw_only=True) # 关键字参数
p1 = Point(1, y=2)
p2 = Point(y=2)
print(p1 == p2)
# True
print(p1)
# Point(x=1, y=2)
print(attr.asdict(p1)) # 转为字典格式
# {'x': 1, 'y': 2}
