python-typing-patterns

예상 결과:

• Use TypeVar to preserve the input type:
• ```python
• from typing import TypeVar
• T = TypeVar('T')
• def identity(x: T) -> T:
• return x
• ```
• Result: identity(42) returns int, identity('hello') returns str

예상 결과:

• Use Pydantic with EmailStr:
• ```python
• from pydantic import BaseModel, EmailStr
• class User(BaseModel):
• email: EmailStr
• ```
• This automatically validates and normalizes email addresses when creating User instances.