On Mar 28, 1:47 pm, Scott David Daniels <scott.dani...@acm.org> wrote: > mark.sea...@gmail.com wrote: > > ... > > It appears that if I make the class a subclass of long... > > class bignumber(long): > > def __init__(self, initval): > > self.val = initval > > > Then if I make a new class of subclass of bignumber... > > class myclass(bignumber): > > def __init__(self, another_custom_class) > > bignumber.__init__(self, 0) > > do some stuff with another_custom_class > > > When I try to use this, I get an error sort of like this: > > "TypeError: long() argument must be a string or a number, not > > [whatever type another_custom_class is]" > > Remember that long is an immutable class (so you need to fiddle __new__, > not __init__). So, do something a bit more like: > > class BigNumber(long): > def __repr__(self): > return '%s(%s)' % (type(self).__name__, self) > > class HugeNumber(BigNumber): > def __new__(class_, something): > return BigNumber.__new__(class_, something * 3) > > then you can do something like: > print 'dog = %r = %016X' % (HugeNumber(123), HugeNumber(123)) > > Hope that helps. > > --Scott David Daniels > scott.dani...@acm.org- Hide quoted text - > > - Show quoted text -
Thanks, Scott. I'm not sure what the "something * 3" does? Here is the printout: dog = HugeNumber(369) = 0000000000000171 But I was able to put the concept into practice. -- http://mail.python.org/mailman/listinfo/python-list
