for n in nuke.allNodes():
 if n.Class() == 'Blur':
  n["disable"].setExpression('$gui')


You were using myblurNode["disable"].setValue(exp) at each iteration instead of 
"i" which is why it was setting only the first node. Better use class() instead 
as a blur node might not necessarily contain "blur" in its name. Also, setValue 
expects value for the knob type (boolean in this case), try setExpression 
instead.
Cheers,
D



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