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I'm a -1 on this one. We don't have anything in CPython that's using $XDG_CONFIG_HOME for now. We do have a few cases where we read config files from home dir like IDLE or netrc. This increases the maintenance effort, introduces some inconsistency, without much benefits. I understand that this method stores the user data/config per app instead of per user, but if we really need to do that, we should do it for the whole Python, not just pdb - then it would probably be a PEP-level change.

I think you need to at least get some supports from other people - users from d.p.o. and/or some core devs. That would show that people are interested in this feataure. At this moment I'm not fully convinced that we should have this.

@gaogaotiantian thank you for the detailed response! Could you please keep this PR open for a week or two? I'll drop a post in Discourse and get back here.

I won't close this PR. Feel free to gather some opinions and promote this again in the future.