python: union keys from multiple dictionary?

Question

I have 5 dictionaries and I want a union of their keys.

alldict =  [dict1, dict2, dict3, dict4, dict5]

I tried

allkey = reduce(         


        

Answer 1

set().union(dict1.keys(),dict2.keys()...)

I tried the list and it didnt work so just putting it up here for anyone.