def METHOD_NAME(x=None):
    """Disassemble classes, methods, functions, or code.
    With no argument, disassemble the last traceback.
    """
    if x is None:
        distb()
        return
    if isinstance(x, types.InstanceType):
        x = x.__class__
    if hasattr(x, 'im_func'):
        x = x.im_func
    if hasattr(x, 'func_code'):
        x = x.func_code
    if hasattr(x, '__dict__'):
        items = x.__dict__.items()
        items.sort()
        for name, x1 in items:
            if isinstance(x1, _have_code):
                print "Disassembly of %s:" % name
                try:
                    METHOD_NAME(x1)
                except TypeError, msg:
                    print "Sorry:", msg
                print
    elif hasattr(x, 'co_code'):
        disassemble(x)
    elif isinstance(x, str):
        disassemble_string(x)
    else:
        raise TypeError, \
              "don't know how to disassemble %s objects" % \
              type(x).__name__