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

[Lisa Roach]

Lisa Roach <lisaroach14 at gmail.com> added the comment:

I think these changes look good, ganziqim has real code improvements (in the form of adding lazycache to __all__ and using clear() in clearchache), as well as improving the code formatting for readability.

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