Inconsistent usage of IntArrayBoundedValidator in Python

[martyngigg]

This issue was originally TRAC 8934

Dear Mantid team,
I just stumbled accross some inconvenience as I wanted to declare an array
property where the individual values are supposed to have a minimum, but
not a maximum value.

For single numbers it is very convenient:

self.declareProperty('SingleNonNegativeInt',  0,
                      direction = Direction.Input,
                      doc = "a non-negative integer",
                      validator=IntBoundedValidator(lower=0.))

But for an array it does not work like this:

theProp = IntArrayProperty(name='PositiveNumbers',
                            validator = IntArrayBoundedValidator(lowerBound=1),
                            direction = Direction.Input)
self.declareProperty(theProp, doc = "Positive integers")

(Nasty anyway that here it is lowerBound whereas for non-arrays it is lower)

This is because 'IntArrayBoundedValidator' does not have default arguments
nor understands 'None'. This is the workaround:

onlyLowerBound = IntArrayBoundedValidator(lowerBound=1, upperBound=1)
onlyLowerBound.clearUpper()
theProp = IntArrayProperty(name='PositiveNumbers',
                            validator = onlyLowerBound,
                            direction = Direction.Input)
self.declareProperty(theProp, doc = "Positive integers")

Would be nice if setting bounds on single values or arrays would behave
similarly (and in an easy way).

[martyngigg]

@NickDraper (2014-02-14T11:07:55):
bulk move to assigned at the into of the triage step