Passing empty sequence to random.choice function leads to:Traceback (most recent call last):  ...ValueError: number of bits must be greater than zeroDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  ...IndexError: Cannot choose from an empty sequence* the ValueError doesn't add any useful information, only bloats stderr* the "During handling" line indicates that something went wrong inside random.pyThis patch uses `raise x from None` to hide the ValueError, resulting in much cleaner output.-Tested on Python 3.7.0a0

Seems reasonable to me.

New changeset0001ae913759 by Raymond Hettinger in branch '3.6':Issue#29055: Suppress upstream exception for random.choice()https://hg.python.org/cpython/rev/0001ae913759

Thanks for the patch.Please submit a contributor agreement for future work.  We would like to have it for all patches (though this one was so tiny it isn't strictly required).