[issue32173] linecache.py add lazycache to __all__ and use dict.clear to clear the cache

[GanZiQim]

Change by GanZiQim <ganziqim at live.com>:


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keywords: +patch
pull_requests: +4555
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32173>
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