[issue31415] Add -X option to show import time

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

> `PYTHONPROFILEIMPORTTIME=x python` isn’t *too* onerous

It does not work on Windows.

C:\Users\Terry>PYTHONPROFILEIMPORTTIME=x python
'PYTHONPROFILEIMPORTTIME' is not recognized as an internal or external command, operable program or batch file.

Does it set the EV for the entire session (which one likely would not want), or just the one command (which has no Windows equivalent that I know of)?  Please leave the easily remembered and typed option.

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<https://bugs.python.org/issue31415>
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