class getunits:
    def analyze ( self , event = None ):
        units, uDisplay = self.unitCalc()
        cType = (u'PNU',u'in',u'ft',u'mm',u'cm',u'm')[['PNU','Inches','Feet','MM','CM','Metres'].index(units)]
        convert  = self.ConvertToPNU(1.0, cType)
        return units

    def unitCalc( self, event = None ):
        prefs=os.path.join(poser.PrefsLocation(),'poser.ini')
        if os.path.exists(prefs):
            pref=open(prefs,'rb').readlines()
            for line in pref:
                if line.lower().startswith('unit'):
                    line = line.split(' ')
                    if 'FACTOR' in str(line[0]):
                        units = float((line)[1])
        uDisplay, pType = float(self.response(units)[1]) , self.response(units)[0] 
        return pType, uDisplay

    def ConvertToPNU( self, value = 1, unit = '' ):
        multiplier = (1.0, 103.2, 8.6, 2621.28, 262.128, 2.62128)[[u'PNU', u'in', u'ft', u'mm', u'cm', u'm'].index(unit)]
        return value * multiplier

getunits = getunits()
analyze = getunits.analyze()

print analyze

get your own units or convert them using this script ( will need a little modification for purpose).

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