[Python-ideas] Should Python have user-defined constants?

[brent bejot]

Are there any 3rd party tools that already implement this?  By my
understanding, type annotations started as 3rd party tools that became
popular and so are now incorporated into the language proper.  I could see
a 'const' syntax making its way into the language that way, but not
directly.  Certainly this idea has been hashed out multiple times before.
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