[issue35338] set union/intersection/difference could accept zero arguments

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Some reading: http://mathforum.org/library/drmath/view/62503.html

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35338>
_______________________________________