Weird one, but there is a solution.

import __builtin__ as bi<br></br>import Blender as B<br></br>class myAdder:<br></br>    def __init__(self):<br></br>        self.localVal = 0<br></br><br></br>    def addValue(self):<br></br>        self.localVal = self.localVal + 1<br></br><br></br>    def getValue(self):<br></br>        return self.bi.str(self.localVal)<br></br><br></br>try:<br></br>    ma = B.myClass<br></br>    ma.addValue()<br></br>except:<br></br>    ma = myAdder()<br></br>    ma.bi = bi<br></br>    B.myClass = ma<br></br><br></br>print ma.getValue()

If you don't return a string value from myAdder.getValue() everything would work without any messing around. import Blender as B

class myAdder:

    def init(self):

        self.localVal = 0



    def addValue(self):

        self.localVal = self.localVal + 1



    def getValue(self):

        return self.localVal



try:

    ma = B.myClass

    ma.addValue()

except:

    ma = myAdder()

    B.myClass = ma



print ma.getValue()

If your catching an exception, then it's a good idea, while developing to still print the exception out using import traceback

traceback.print_exc()

just in case you run into something weird.