PyCon2011_AdvancedPythonWaveletDebugging.py

class Var:
    def __init__(self, name):
        self.name = name
    def __repr__(self):
        return self.name
    def __add__(self, other):
        return Var('({0.name}+{1.name})'.format(self, other))
    def __sub__(self, other):
        return Var('({0.name}-{1.name})'.format(self, other))
    def __truediv__(self, other):
        return Var('{0.name}/{1}'.format(self, other))

print(wavelet((Var('a'), Var('b'), Var('c'), Var('d'))))