[issue40807] Codeop: Show warnings once during _maybe_compile

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

I think that might have introduce https://bugs.python.org/issue41520 where now `warnings.simplefilter('error', SyntaxWarning)` is silently ignored...

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nosy: +mbussonn

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<https://bugs.python.org/issue40807>
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