35 lines
906 B
Python
35 lines
906 B
Python
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# 正确示例：显式类型注解
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import os
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from pydantic import BaseModel
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class User(BaseModel):
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id: int # 显式指定int类型
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name: str # 显式指定str类型
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is_active: bool = True # 带默认值的类型注解
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# 错误示例：缺少类型注解
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# class BadUser(BaseModel):
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# id = 1 # 缺少类型注解，Pydantic 2.9+将报错
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# name = "John" # 缺少类型注解，Pydantic 2.9+将报错
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os.environ['app_port'] = '8888'
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# 环境变量自动映射示例
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from pydantic_settings import BaseSettings, SettingsConfigDict
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class AppConfig(BaseSettings):
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host: str = "localhost"
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port: int = 8000
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model_config = SettingsConfigDict(
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env_prefix="APP_", # 环境变量前缀
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case_sensitive=False # 不区分大小写
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)
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# 当环境变量存在APP_PORT=8080时
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config = AppConfig()
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print(config.port) # 输出: 8080 (而非默认的8000)
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