> On Apr 5, 2021, at 4:43 AM, Shreyan Avigyan <[email protected]> wrote:
> 
> Yes you are right. But isn't informing people about a change the work of 
> PEP? I mean this is kind of a major change because we're trying to change the 
> error message and/or the type. If the type is not changed then no PEP is 
> required but if the type is changed then there comes a maybe. What should be 
> the perfect solution?

There’s no need for a new exception type. What code would catch this new 
exception? Just update the text of the existing exception, and update the 
documentation if need be. 

There’s no need for a PEP. Many, many changes are made without PEPs. Just open 
an issue on bugs.python.org and create a PR. 

Eric
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