I have problems with these two classes: class LPU1(): def __init__(self, formula): """ formula is a string that is parsed into a SymPy function and several derived functions """ self.formula = formula ... ...
class LPU3(LPU1): def __new__(self): """ the same functions as LPU1 but some added functions and some functions redefined """ ... ... if __name__ == '__main__: y = y = 'x_0 * x_1 + x_2' stats1 = LPU1(y) stats3 = LPU3(y) Worked perfectly on Python 2.7.5+ but on Python 3.3.2+ I get on instantiatiating stat3: TypeError: __new__() takes 1 positional argument but 2 were given What am I doing wrong? I must confess I am a bit out of my depth here so any explanation will be a learning experience. Many thanks, Janwillem -- https://mail.python.org/mailman/listinfo/python-list