#!/usr/bin/env python3

def dump_func(fn):
    def dump(self, b):
        print('\t%s.%s %s %s' % (
            fn.__name__,
            self.__class__.__name__,
            self,
            b))
        return fn(self, b)
    return dump

class mybase(object):
    def __init__(self):
        self.num = None

    def __str__(self):
        return '%s(%s)' % (
            self.__class__.__name__,
            self.num)

    @dump_func
    def __rmul__(self, b):
        return self.__mul__(b)

class myint(mybase):
    def __init__(self, num):
        self.num = num

    @dump_func
    def __mul__(self, b):
        if isinstance(b, myint):
            return myint(self.num+'*'+b.num)
        return NotImplemented

class myfloat(mybase):
    def __init__(self, num):
        self.num = num

    @dump_func
    def __mul__(self, b):
        print('\tmul.f', self, b)
        if isinstance(b, myint):
            return myfloat(self.num+'*'+b.num)
        if isinstance(b, myfloat):
            return myfloat(self.num+'*'+b.num)
        return NotImplemented

class mydouble(mybase):
    def __init__(self, num):
        self.num = num

    @dump_func
    def __mul__(self, b):
        print('\tmul.f', self, b)
        if isinstance(b, myint):
            return mydouble(self.num+'*'+b.num)
        if isinstance(b, myfloat):
            return mydouble(self.num+'*'+b.num)
        if isinstance(b, mydouble):
            return mydouble(self.num+'*'+b.num)
        return NotImplemented

i = myint('1')
f = myfloat('2')
d = mydouble('3')

for x in [i, f, d]:
    for y in [i, f, d]:
        print(x*y)