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@0xl3vi, thanks for your PR! By analyzing the history of the files in this pull request, we identified@brettcannon,@tiran,@vsajip,@doko42 and@freddrake to be potential reviewers.

I signed the CLA 😉

This is a nice change, and it would probably let me get rid of my $PYTHONSTARTUP setting. I wonder ifpython3 -h should mention this new envar?

@warsaw I added this to Misc/python.man

@0xl3vi Thanks, that looks good. It's still not mentioned inpython3 -h but I'm not entirely sure it needs to. There are otherPYTHON* environment variables not mentioned in the--help output.

@warsaw I updated main.c forpython -h,
blank line fixed.

The changes look great to me, but I'm going to wait just a bit before merging this.

• I'd like to see if any other core dev has an opinion about the change
• The AppVeyor test is failing, although I suspect that is unrelated to your change

I don't have a Windows environment to test that on. Maybe@zooba can weigh in on that. Alternatively, try rebasing against master if it's been fixed there.

If there are no other follow ups by this weekend, I'll merge your change.

Can you please also add aMisc/NEWS entry (knowing that our workflow for that kind of sucks and we might get conflicts)?

Also there should be an issue opened on bugs.python.org to document this and the issue number added to the title of this pull request.

@warsaw I tried rebasing against master and the build passed!
and Misc/NEWS updated.

@ned-deily I updated cmdline.rst and created new issuehttp://bugs.python.org/issue29779

P.S: I need to add bpo-XXX or just the issue number in bugs.python.org?

Oh, and it would be nice to add a test for codecov.

Thanks for addressing my comments!

@warsaw all done, I changed set_history_file() to gethistoryfile().
and added test.

@0xl3vi We still need a test.

Oh and yay for Misc/NEWS conflicts. :(

Also notethis report which I can confirm.

@warsaw sorry for the dealy.
what tests we need add?

regardingthis
If the PYTHONHISTORY is empty it will fall back to .python_history.
there is no error on my build

@0xl3vi At the very least, I think a test coveringgethistoryfile() would be useful. If you can mock out enough of the readline stuff (or other safeguards so as not to interfere with the environment of a person running the tests), then adding some coverage forenablerlcompleter() would be nice.

The bug happens when the file pointed to byPYTHONHISTORY does not exist.

@warsaw OK updated.

• In case PYTHONHISTORY will be empty or not set,
  it wil fall back to the default history file.
  if the file pointed by PYTHONHISTORY does not exist readline will create one.

The test checks if gethistoryfile() reads the variable.
Bash will expand '~' so we dont need to to test the path.

what do you think?

OK, I don't have time to do it.
If someone else want to implement this please do so.

@0xl3vi Hi. I'm sorry this has taken so long. Are you saying in your comment that you don't have time to finish this branch? If so, that's okay and we greatly appreciate your contribution so far. I'm willing to finish this branch for you if you'd like.

@warsaw sure if you want.
thanks 👍

@warsaw@berkerpeksag I have created a new PR for this feature:GH-13208. It addresses all of@berkerpeksag's comments.