how to loop grass command in python and put variable in output file

anyone,

first day Grass programming with python scripting; first prob;

simple I want to reclass the same raster several times; and save the file with the value loop variable at the end ... can not get it working;

    import sys
    import os
    import atexit

    import grass.script as grass

    def cleanup():
        pass

    def main():
        for i in range (2,4):
        out = "reclasstest" + str(i)
        rulesvar = "C:\Grass_data\datareclassfile") + str(i) 
        grass.run_command("r.reclass",
                          overwrite = True,
                          input = "glg@PERMANENT",
                          output = out,
                          rules = rulesvar)

        return 0

    if __name__ == "__main__":
        options, flags = grass.parser()
        atexit.register(cleanup)
        sys.exit(main())

greetz, piet