python field函数

from dataclasses import field, dataclass@dataclass
class Employ:name: strage: int = field(default=30)position: str = field(default='Developer', metadata={'description': 'the job title'})zhangsan = Employ(name='zhangsan')
print(zhangsan)

 

 

import traceback
from dataclasses import dataclass@dataclass
class Retangle:width: intheight: intdef __post_init__(self):if self.width < 0 or self.height < 0:raise ValueError('width or height invalid')try:retangle = Retangle(width=-1, height=2)
except Exception:traceback.print_exc()