I have no real objections. I had considered doing this originally but figured it could wait. Here we are. 😄

I tried to implementSimpleNamespace.__replace__, and the code may be simpler with this feature:

args= (self.__dict__,)returntype(self)(*args,**kwargs)

instead of

d= {}d.update(self.__dict__)d.update(kwargs)returntype(self)(**d)

On other hand, I decided to use other way (#109175), which is more consistent with pickling and copying:

result=type(self)()result.__dict__.update(self.__dict__)result.__dict__.update(kwargs)returnresult

So this is no longer a blocker.

When you're done making the requested changes, leave the comment:I have made the requested changes; please review again.

I have made the requested changes; please review again.

Thanks for making the requested changes!

@erlend-aasland,@ericsnowcurrently,@AA-Turner,@carljm: please review the changes made to this pull request.

It would be good to get@rhettinger's feedback, but this PR already received many positive feedbacks, and I already invested in this issue so much, that I'm going to merge it anyway, even if initially I was not so interested in this.

Looks like a merge conflict needs to be resolved.