文档:​​http://www.attrs.org/en/stable/index.html​

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}