[New-bugs-announce] [issue42910] Wrong code appears in the type alias introduction

[Casuall]

New submission from Casuall <Smile_zjk at qq.com>:

I learned about type aliases on the page（https://docs.python.org/3/library/typing.html）, and I found that following the code (Vector = list[float])in the tutorial, an error occurred (NameError: name 'typing' is not defined) when running.

The following code has the same problem：
  ConnectionOptions = dict[str, str]
  Address = tuple[str, int]
  Server = tuple[Address, ConnectionOptions]

I searched through google and found the correct code：
  from typing import List
  Vector = List[float]

  from typing import Dict, Tuple, Sequence
 
  ConnectionOptions = Dict[str, str]
  Address = Tuple[str, int]
  Server = Tuple[Address, ConnectionOptions]

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assignee: docs at python
components: Documentation
messages: 384944
nosy: Smile-zjk, docs at python
priority: normal
severity: normal
status: open
title: Wrong code appears in the type alias introduction

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42910>
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