---
tags: blog
---

# python 筆記
每一代新出值得注意的新語法筆記一下

## 3.11
> 文件還在寫，目前看起來主要是效能上的改進

## 3.10

with (CtxManager() as example):
    ...

with (
    CtxManager1(),
    CtxManager2()
):
    ...

with (CtxManager1() as example,
      CtxManager2()):
    ...

with (CtxManager1(),
      CtxManager2() as example):
    ...

with (
    CtxManager1() as example1,
    CtxManager2() as example2
):
    
# 變成
with (
    CtxManager1() as example1,
    CtxManager2() as example2,
    CtxManager3() as example3,
):

> 終於有 switch 了
> [name=CodingMan][time=Fri, Oct 29, 2021 3:54 PM]

def http_error(status):
    match status:
        case 400:
            return "Bad request"
        case 404:
            return "Not found"
        case 418:
            return "I'm a teapot"
        case 401 | 403:
            return "qqqqq"
        case _:
            return "Something's wrong with the internet"

def square(number: int | float) -> int | float:
    return number ** 2

isinstance(1, int | str)

## 3.9

### Type Hinting Generics In Standard Collections

> 再也不用 import typing
> [name=CodingMan]

- before

from typing import List
def greet_all(names: List) -> None:
    # your code here

- after

def greet_all(names: list[str]) -> None:
    # your code here

## 3.8