pydantic 模块仅在 init 中检查变量答案

【问题标题】：pydantic module check the variables only in initpydantic 模块仅在 init 中检查变量
【发布时间】：2019-05-22 06:54:48
【问题描述】：

pydantic 模块只检查 init 中的变量

pip 安装 pydantic

例子

from pydantic.dataclasses import dataclass
@dataclass
class Glass:
    capacity_volume : float
    occupied_volume : float

glass = Glass(300, 100)       # OK int to float
print(glass) # Glass(capacity_volume=500.0, occupied_volume=0.0)

glass = Glass(300.0, 100.0)   # OK 
print(glass) # Glass(capacity_volume=500.0, occupied_volume=0.0)

glass = Glass('300', '100')   # OK str to float    
print(glass) # Glass(capacity_volume=500.0, occupied_volume=0.0)

glass.capacity_volume = '300' 
print(glass) # Glass(capacity_volume='300', occupied_volume=0.0)

如果设置了变量的类型，是否可以检查？

【问题讨论】：

标签： python pydantic

【解决方案1】：

是的，如果我理解正确的话，完全有可能：

from pydantic.dataclasses import dataclass

class Config:
    validate_assignment = True

@dataclass(config=Config)
class Glass:
    capacity_volume: float
    occupied_volume: float

glass = Glass('300', '100')
print(glass)  
#> Glass(capacity_volume=300.0, occupied_volume=100.0)

glass.capacity_volume = '400'
print(glass)  
#> Glass(capacity_volume=400.0, occupied_volume=100.0)

【讨论】：