fastapi

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from typing import Any, Union
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from fastapi import FastAPI
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from pydantic import BaseModel, EmailStr
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app = FastAPI()
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class UserIn(BaseModel):
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    username: str
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    password: str
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    email: EmailStr
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    full_name: Union[str, None] = None
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class UserOut(BaseModel):
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    username: str
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    email: EmailStr
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    full_name: Union[str, None] = None
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@app.post("/user/", response_model=UserOut)
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async def create_user(user: UserIn) -> Any:
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    return user
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