bpo-32173: linecache.py add lazycache to __all__ and use dict.clear to clear the cache

[ganziqim]

https://bugs.python.org/issue32173

[the-knights-who-say-ni]

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[lisroach]

I think this is a reasonable diff, lazycache should be added to all and the clearcache is improved by using clear().

The extra code changes are just semantics which help code readability without changing any functionality.

[ganziqim]

I've been signed for three times, but the state has not changed

[asvetlov]

CLA status updated

[ganziqim]

news entry added

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[csabella]

This issue is approved by 2 core developers, but was waiting on an update to the blurb.

@ganziqim Please make the last changes requested by Mariatta, after which I believe this will be ready to merge. Thanks!

[ganziqim]

This issue is approved by 2 core developers, but was waiting on an update to the blurb.

@ganziqim Please make the last changes requested by Mariatta, after which I believe this will be ready to merge. Thanks!

done.

[csabella]

@ganziqim Thanks!

@lisroach @asvetlov I believe Mariatta is out of open source starting today, so, if you can, please review the changes made to the news entry. Thank you!