[docs] [issue17854] symmetric difference operation applicable to more than two sets

Terry J. Reedy report at bugs.python.org
Sun May 5 00:12:48 CEST 2013

Terry J. Reedy added the comment:

If you take the union/intersection/symmetric difference of n sets, the result is a set with all items that appears in one/all/an odd number of the n sets. The union and intersection methods actually accept n inputs, because the result is obvious, useful, and can be obtained faster that with n-1 binary operations. The symmetric_difference method does not, I presume because the result in not obvious (but that cuts both ways), not known to be useful, and perhaps would not be much faster than than n-1 binary operations.


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