[issue17554] Compact output for regrtest

[Ezio Melotti]

Ezio Melotti added the comment:

I fixed all the tests that were producing extra output on my machine, but there are probably some left on other machines.  Using -uall also produces extra output, and I haven't decided how to deal with that yet (maybe it should be silenced as well).
Getting this right might require to introduce e.g. a new regrtest/support.print() function though...

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<http://bugs.python.org/issue17554>
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