[issue45944] Avoid calling isatty() for most open() calls

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

What if change FileIO.isatty() instead? If make it returning False without invoking a system call if the file size is non-zero it will eliminate the need to expose _size.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue45944>
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