thautwarm <yaoxiansa...@gmail.com> added the comment:

I think it depends on the use case. If `repr` wouldn't be invoked except 
debugging,some IO operations might not be that bad.

I'm to make some adjustments to avoid displaying the contents if nothing 
evidence that IO operations is not bad.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34953>
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