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test/test_pydantic/test.py

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