z3py - z3.prove is much faster than solver and check -

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I am using the latest z3 master code from codeplex, tagged as v4.3.1.

I want a function such as proven which has a useful return value and does not print. So, I have written that what was visible: 

  def prov2 (claim): s = solver () s.add (not (claims)) if s.check () == However, this code runs dramatically with the default  proven  function.  
  is the code for  proven  (slimmed) in  src / api / python / z3.py :  
  Def proven (claim, keyword **): S = Solver () s.set (** keyword) s.add (not (claims)) if keywords.get ('show', false): print sr = s.check () If r == unsat: print "proved" aliff R == unknown: print "failed to prove" print s.model () Other: print "counterexample" print s.model ()   
 When I  S.set ()  in my code, it's fast and finds the same counterexample.  
 What's going on here?  
     
  •  Is this empty call  
  •   
  •  something else?  
  •  
  •   
     I tried to figure out what default was the solver option, but  str (s)   repr (s) ,  s. __ , and Google really did not help.  
     Any advice is appreciated! The best estimate is that the default option was my special case, maybe a random number difference or 
     
     Due to some other non-deterministic internal condition.

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