python 定义类对属性进行检验

from pydantic import baseModel, validator


class UrlCreate(baseModel):
    link: str

    @validator("link")
    def check_link(self, v):
        if v is None or v == "":
            raise ValueError(f"{v} is None, please check link")
        if v.startswith("http://") or v.startswith("https://"):
            return v
        else:
            raise ValueError(f"{v} is not a valid link")