'str' object has no attribute 'intersection' and unhashable set (Reposting On Python-List Prohibited)

Wed Oct 5 03:24:09 EDT 2016

i do not understand, 

how to solve this frozonset ?

Lawrence D’Oliveiro於 2016年10月5日星期三 UTC+8下午2時24分13秒寫道：
> On Wednesday, October 5, 2016 at 2:35:25 PM UTC+13, meInvent bbird wrote:
> > it return unhashable type 'set'
> 
> This is what “frozenset” is for--it’s the immutable counterpart of “set”.
> 
> Data-typing supersymmetry, anybody?