Sandbox::https://github.com/urihell/python0/blob/master/converters.py

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#05_01_converter

class ScaleConverter:

def __init__(self, units_from, units_to, factor):

self.units_from = units_from

self.units_to = units_to

self.factor = factor

def descriprtion(self):

return 'Convert ' + self.units_from + ' to ' + self.units_to

def convert(self,value):

return value * self.factor

class ScaleAndOffsetConverter(ScaleConverter):

def __init__(self, units_from, units_to, factor, offset):

ScaleConverter.__init__(self, units_from, units_to, factor)

self.offset = offset

def convert(self, value):

return value * self.factor + self.offset