efficent test for array with only one value?

[Scott David Daniels]

Kyler Laird wrote:
> Robert Kern <rkern at ucsd.edu> writes:
> ... I'm guessing that reduce
> will not stop immediately when equal encounters a False. 

If the early stop is what you want, how about:
     if vector:
         d = {}
         d[vector[0]] = 0
         try:
             for el in vector:
                 d[el]
         except KeyError:
             return False
     return True

-Scott David Daniels
Scott.Daniels at Acm.Org