Python Unit Converter

class UnitConversion:
    units = [ "mm", "cm", "dm", "m", "dam", "hm", "km", "in", "ft", "yd", "mi" ]

    metersInInch = 0.0254
    metersInFoot = 0.3048
    metersInYard = 0.9144
    metersInMile = 1609.344

    def metersToMillimeters( self, meters ):
        return( meters * 1000 )

    def millimetersToMeters( self, millimeters ):
        return( millimeters / 1000 )

    def metersToCentimeters( self, meters ):
        return( meters * 100 )

    def centimetersToMeters( self, centimeters ):
        return( centimeters / 100 )

    def metersToDecimeters( self, meters ):
        return( meters * 10 )

    def decimetersToMeters( self, decimeters ):
        return( decimeters / 10 )

    def metersToDecameters( self, meters ):
        return( meters / 10 )

    def decametersToMeters( self, decameters ):
        return( decameters * 10 )

    def metersToHectometers( self, meters ):
        return( meters / 100 )

    def hectometersToMeters( self, hectometers ):
        return( hectometers * 100 )

    def metersToKilometers( self, meters ):
        return( meters / 1000 )

    def kilometersToMeters( self, kilometers ):
        return( kilometers * 1000 )

    def metersToInches( self, meters ):
        return( meters * self.metersInInch )

    def inchesToMeters( self, inches ):
        return( inches / self.metersInInch )

    def metersToFeet( self, meters ):
        return( meters * self.metersInFoot )

    def feetToMeters( self, feet ):
        return( feet / self.metersInFoot )

    def metersToYards( self, meters ):
        return( meters * self.metersInYard )

    def yardsToMeters( self, yards ):
         return( yards / self.metersInYard )

    def metersToMiles( self, meters ):
        return( meters * self.metersInMile )

    def milesToMeters( self, miles ):
        return( miles / self.metersInMile )

    functions = {   'mtomm': metersToMillimeters,
                    'mmtom': millimetersToMeters,
                    'mtocm': metersToCentimeters,
                    'cmtom': centimetersToMeters,
                    'mtodm': metersToDecimeters,
                    'dmtom': decimetersToMeters,
                    'mtodam': metersToDecameters,
                    'damtom': decametersToMeters,
                    'mtohm': metersToHectometers,
                    'hmtom': hectometersToMeters,
                    'mtokm': metersToKilometers,
                    'kmtom': kilometersToMeters,
                    'mtoin': metersToInches,
                    'intom': inchesToMeters,
                    'mtoft': metersToFeet,
                    'fttom': feetToMeters,
                    'mtoyd': metersToYards,
                    'mtoyd': yardsToMeters,
                    'mtomi': metersToMiles,
                    'mitom': milesToMeters  }

    def convert( self, userInput ):
        values = userInput.split()

        if( len( values ) != 3 ):
            return( "Error: You entered an incorrent number of values" )

        try:
            values[0] = float( values[0] ) if '.' in values[0] else int( values[0] )
        except ValueError:
            return( "Error: The first value must be a number" )

        if( values[1] == values[2] ):
            return( values[0] )

        if( not values[1] in self.units ):
            return( "Error: The second value is not a known unit" )

        if( not values[2] in self.units ):
            return( "Error: The third value is not a known unit" )

        function = values[1] + "to" + values[2]

        if( not function in self.functions ):
            return( "Error: This conversion is currently not supported" )

        return( self.functions[function]( self, values[0] ) )

def main():
    uc = UnitConversion()

    print( "Input should be formated like this:\n<value> <original unit> <new unit>\nSpaces are mandatory!" )

    userInput = raw_input()

    answer = uc.convert( userInput )

    print( answer )

if __name__ == '__main__':
    main()