Casuall <smile_...@qq.com> added the comment:

I am using python3.8, it turned out to be a version issue, sorry

------------------&nbsp;原始邮件&nbsp;------------------
发件人:                                                                            
                                            "Python tracker"                    
                                                                
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发送时间:&nbsp;2021年1月12日(星期二) 晚上10:50
收件人:&nbsp;"破碎的冰"<smile_...@qq.com&gt;;

主题:&nbsp;[issue42910] Wrong code appears in the type alias introduction

Serhiy Storchaka <storchaka+cpyt...@gmail.com&gt; added the comment:

What version of Python did you use? This is a documentation for Python 3.9.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org&gt;
<https://bugs.python.org/issue42910&gt;
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