def load_dynamic_class(fqn, subclass):
 if (not isinstance(fqn, basestring)):
  return fqn
 cls = load_class_from_name(fqn)
 if ((cls == subclass) or (not issubclass(cls, subclass))):
  raise TypeError(('%s is not a valid %s' % (fqn, subclass.__name__)))
 return cls

def load_dynamic_class ( fqn , subclass ) : if ( not isinstance ( fqn , basestring ) ) : return fqn cls = load_class_from_name ( fqn ) if ( ( cls == subclass ) or ( not issubclass ( cls , subclass ) ) ) : raise TypeError ( ( '%s is not a valid %s' % ( fqn , subclass . __name__ ) ) ) return cls
dynamically load fqn class and verify its a subclass of subclass .